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Publication numberUS2716338 A
Publication typeGrant
Publication dateAug 30, 1955
Filing dateApr 8, 1954
Priority dateApr 8, 1954
Publication numberUS 2716338 A, US 2716338A, US-A-2716338, US2716338 A, US2716338A
InventorsBlinn Welford C
Original AssigneeBlinn Welford C
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Button type package humidity indicator
US 2716338 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)

A g- 3 1955 I w. c. BLINN 2,716,338


Zi Z/o/"d C 528 2777. BY


United States Patent BUTTON TYPE PACKAGE HUMIDITY INDICATOR Welford C. Blinn, Colton, Calif.

Application April 8, 1954, Serial No. 421,891

2 Claims. (Cl. 73-73) This invention relates to package humidity indicators .5

and more specifically to an indicator of the button type.

A primary object of the invention is to provide a humidity indicator which forms an integral part of a closed container, or a moistureproof bag, and permits the observer to note the humidity of the air within the container.

Another object is to provide a card having a number of spots of chemical matter impregnated therein so that each spot may indicate a separate humidity.

A further object is the provision of a humidity indicator of a stable nature which will indicate a critical range of humidities within a closed container so as to prevent material in storage and transit from rusting or otherwise deterioriating due to leakage.

Another object is to provide a humidity indicator having an inexpensive window through which the chemical spot indicators may be seen without having to break the container seal.

A further object is to provide a device having a window which does not project materially so as to permit stacking of containers during transit and storage.

An important object is to provide a button type device that is reusable and one that can be attached to a package without the use of glue, grommets, or of parts having expensive machined threads or fittings that must be machined into the package at the time of manufacture.

Another object is to provide a window made of moistureproof materials that are low in cost and readily applied with hand pressure or a standard tool.

Other objects and advantages will become apparent from the following description and drawings, in which:

Fig. 1 is a perspective view of a package withthe improved button type humidity indicator secured thereto.

Fig. 2 is an enlarged plan view of the indicator.

Fig. 3 is a sectional view taken on line 33 of Fig. 2.

Fig. 4 is a bottom plan view of the device shown in Fig. 3.

Fig. 5 is a sectional view taken on line 55 of Fig. 3.

Fig. 6 is a plan view of a card showing a modified form of chemical spots used in the device.

As shown in the drawings the numeral 10 designates a closed package having a hermetically sealed lid 10a. Located inside the package is a product or the like 1%, to be protected from rust and deterioriation by the use of a conventional desiccant 100. An aperture 11 is punched or cut into the package at a suitable place and my improved form of button humidity indicator is placed therein to form a moisturetight and integral part of the package.

Aligned with the aperture 11 and located within the package 10 (see Fig. 3), is a lock nut 14, having internal threads 15 and a flange 16. A gasket 17, preferably made of rubber, is placed between the flange 16 and the lid 10a, and a hollow button 18, having a tubular shank with external threads 19 is inserted through the aperture 11 and screwed into the lock nut 14, said button having a flange '21 around its outer 'end which serves to clamp the lid 10a between the Washer '17 and flange 16 to render the package leakproof. I

As shown "in Figs. 3, 4 and 5, the button 18has web 18a to reinforce the button against an internal pressure :c'ffive pounds per square inch for an indefinite time. The flange 21 of button 18 is provided with a raised portion '23 surrounding a recess or central countersink 24 adapted to receive an indicating card '25. The button 18 has a'ir passages '26 open from the inside of the package and leading to the under surface of the card'ZS.

To insure that the major portion of the under surface of the card 25 is exposed to the air in the package, the button 18 is countersunk at 28 as shown in Fig. 2. The upper surface of the card 25 is provided with a plurality of chemical spots which are impregnated thereinto. The card may be made of blotting paper or the like.

When installed, the button humidity indicator forms a moisturetight and integral part of the package, and permits the humidity of the air within to be observed by noting the color of the chemical spots 30 impregnated on the card 25, each spot indicating a separate humidity.

As shown in Fig. 2, the numerals 32 are located on the spots 30, each numeral serving to indicate a related humidity condition. The printed matter 33 also serves to advise the observer regarding the humidity conditions within the package, as related to the spots 30.

To enclose and protect the card 25, a transparent cover 35 is provided having a dependent flange 36. The flange 36 is mounted in the rabbet 22 of the flange 21 and a solvent or adhesive may be applied with a hypodermic needle or brush to bond the parts together, which is done before the installation of the button 18in said package.

The button 18 and lock nut 14 may be made of metal or like materials, but I prefer to use flexible polystyrene which provides good strength against breakage under impact or strain, and furthermore is moistureproof. The cap 35 is transparent and is made of clear polystyrene. The cap 35 and flange 21 are shown as hexagonal, but any suitable shape may be used.

The form of invention shown in Fig. 6 shows a plurality of chemical spots 39 impregnated on a card 40, the numerals 41 and printed matter 42' serving the same purpose as indicated in Fig. 2.

From the foregoing it is apparent that I have invented a package humidity indicator of the button type that is especially adaptable to small packages. My improved device provides chemical spot indicators that can be easily seen without breaking the seal, and may be secured to the package through a very small hole which is effectively rendered leakproof against a continuous pressure of five pounds per square inch.

My device will register by color change of chemical spots, critical humidity points within almost any type of container now in use and will warn the observer if a leak develops in the package. The device is simple, practical, moistureproof and leakproof.

I reserve the right to make numerous changes in the size, shape and arrangement of the parts without departing from the spirit of the invention, or the scope of the claims.

What I claim is:

1. In a device of the kind described, a unit for mounting in an aperture in the wall of a container, said unit comprising a button, a flange on the button to engage the exterior of the container, said flange having a recess and a rabbet, a card mounted in said recess, the card having chemical spots impregnated therein, a transparent cap mounted in the rabbet of said flange and sealed thereto, and means to secure the said unit to the container in an airtight manner to render the unit leakproof therein, and a transparent cap having around it a flange 1 mounted in said rabbet and sealed thereto to render the unit leakproof, said countersink serving to increase the amount of the cards surface which is exposed to air in communication with the interior of the container.

References Cited in the file of this patent UNITED STATES PATENTS Snelling July 22,

Lindsay Oct. 7,

Clibbon Aug. 3,

Lewis Aug. 5,

FOREIGN PATENTS Germany Dec. 22,

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US2249867 *Jan 15, 1938Jul 22, 1941Marjorie G SnellingDampness detecting and indicating device
US2428426 *Feb 26, 1944Oct 7, 1947Lynn G LindsayDehydrator attachment for tanks
US2446361 *Jul 9, 1945Aug 3, 1948Clibbon Herbert BMoisture vapor indicator for packaged goods
US2605634 *Jul 24, 1950Aug 5, 1952Harold LewisFluid content indicator for cigarette lighters
DE715452C *Mar 24, 1938Dec 22, 1941Buessing Nag Vereinigte NutzkrVorrichtung zur UEberwachung von Gluehkerzen, die zum Anlassen von Dieselmotoren dienen, mittels eines in den Stromkreis der Gluehspiralen der Gluehkerzen eingeschalteten Gluehwiderstandes
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2844026 *Jun 18, 1956Jul 22, 1958Sporlan Valve CoCombined moisture and liquid indicators
US2880691 *Jul 31, 1956Apr 7, 1959Tsunetoshi KobayashiVacuum loss indicator for sealed containers
US2951461 *Nov 12, 1958Sep 6, 1960Lockwood Harry AHumidity indicator device and combination thereof with container
US2994295 *Sep 1, 1959Aug 1, 1961American Radiator & StandardIndicator for refrigeration lines
US3084658 *Apr 20, 1960Apr 9, 1963Edward H SchellHumidity and corrosion indicator
US3142287 *Dec 22, 1961Jul 28, 1964Henry Valve CoRefrigerant moisture-liquid indicator assembly and cap unit therefor
US3408860 *Dec 3, 1965Nov 5, 1968Dow Chemical CoRelative humidity apparatus
US3425388 *Nov 13, 1967Feb 4, 1969Cascade Ind IncHumidity indicator
US3854885 *Sep 3, 1970Dec 17, 1974Us ArmyToxic agent leak detector
US4201080 *May 18, 1978May 6, 1980Bernard SlepakMoisture indicator
US4313743 *Mar 24, 1980Feb 2, 1982Wallace Richard AElectrolytic moisture indicator inside chemical cartridges
US4438783 *Apr 9, 1982Mar 27, 1984Wilfried DreyfussProtective device for pipes
US4793180 *Mar 8, 1984Dec 27, 1988Agm Cargo-Ties, Inc.Delayed action irreversible humidity indicator
US5224373 *May 9, 1991Jul 6, 1993Williams Christi AFlexible humidity indicator and container
US6001151 *Apr 9, 1998Dec 14, 1999Aac Eurovent LimitedFilter assemblies
US6698378Sep 12, 2000Mar 2, 2004Sud-Chemie Inc.Irreversible humidity indicator cards
US6716276 *Jun 25, 2002Apr 6, 2004Desiccare, Inc.Desiccant system
US6877457Feb 26, 2004Apr 12, 2005Sud-Chemie Inc.Irreversible humidity indicator cards
US6997975 *Aug 20, 2003Feb 14, 2006Roberto StefanoniUniversal pan lid absorbing and filtering steam and smell
US7316198 *Nov 26, 2004Jan 8, 2008Yoichi YamakawaHumidity indicator
US7553450Jan 8, 2007Jun 30, 2009Appealing Products, Inc.Irreversible humidity exposure dose indicator device
US8671739Dec 10, 2010Mar 18, 2014Clariant Prosukte (Deutschland) GmbHIndicator material and indicator device comprising said indicator material
US8707762Nov 4, 2011Apr 29, 2014John Gardner PfanstiehlLow cost humidity and mold indicator for buildings
US20040069154 *Aug 20, 2003Apr 15, 2004Roberto StefanoniUniversal pan lid absorbing and filtering steam and smell
US20070113775 *Nov 26, 2004May 24, 2007Yoichi YamakawaHumidity indicator
US20070157702 *Jan 10, 2006Jul 12, 2007Masatami HamadaHumidity indicator labels
US20080163673 *Jan 8, 2007Jul 10, 2008Attar Amir JIrreversible humidity exposure dose indicator device
US20140318436 *Nov 16, 2012Oct 30, 2014Ronan SchonbergPerforating single-use impact indicator, for the transportation of fragile products
US20150345802 *May 30, 2014Dec 3, 2015Amtrol Licensing Inc.Moisture detecting air cap indicator for expansion tank failure
US20160054050 *Aug 12, 2015Feb 25, 2016Samsung Electronics Co., Ltd.Storage container and refrigerator having the same
DE2752508A1 *Nov 24, 1977Jun 1, 1978Bernard SlepakBodenfeuchtigkeitsmesser
EP2463650A1Dec 10, 2010Jun 13, 2012Süd-Chemie AGIndicator material and indicator device comprising said indicator material
U.S. Classification73/73, 312/31.1, 96/117.5, 73/335.1, 96/416, 116/206
International ClassificationG01N31/22
Cooperative ClassificationG01N31/222
European ClassificationG01N31/22C