US 811750 A
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UNITED STATES PATENT OFFICE.
runnniuc o'rro srmssn, or BROOKLYN, new YORK.
Patented Feb. 6,1906.
Application filed August 28, 1905. Serial No- 276,293-
To 0035 whom it may concern.-
Be it known that LFREDERIG O'r'ro SPIESKE, a subl lect of the German Em eror, residing at Broo lyn, in the county of ings and State of New York, have invented new and useful Improvements in Heat-Storing Compounds, of which the following is a specification.
This invention relates to improvements in heat-storing com ounds, such as consist principally of crystalline salts possessing the ability to absorb heat while being reduced from a crystalline to a liquid condition and to give forth heat when returning from should to a crystalline condition. Heat-storing compounds of the character indicated are usually employed in various warming devices, such as rubber bags, food-warmers, carriage-lieu ters, &c. The customary procedure is to place the heat-storing compound while in iquid condition in a soft-rubber bag, or pillow. When it is desired to induce the generation of heat, any old and well-known operation -such, for example, as removing the stopper of the bag or pillow and replacing: it as soon as its temperature has changed-4s resorted to for starting recrystallization of the heat-storing compound.
One of the principal objections of the heatstoring com ounds in general use is that they reduce sue 1 hard crystals in the soft-rubber a or illow for medical )urposes that not onfyist e patient subjected frequently to discomfort, but also the bag or pillow is damaged. It has been proposed heretofore to prevent the formation of hard crystals by mixing with the acetate of soda or other heatstoring salt a non-crystalline substance such, for example, as glvcerin, extract of sunflower-seed or of Greek hay-seed, and the like. The princi al objection to the addition of non-crysta inc substances of the character indicated is that in order to produce a soft crystal it is necessary to add so great a proportion of the non-crystalline substance that the heat-storing salt is deprived of a rest part of its heat-storing pro erty. li the quantity of non-crystalline su bstance be decreased, so as to prevent the same from seriously allecting the action of the heat-storing salt, it is found in practice that the acetate of soda or other salt forms generally into sharp needle-shaped crystals, which are sullieiently hard to dam age the soft-rubber bag or pillow, as well as to cause discomfort to the patient. A further objection to the addition of noncrystelline substances of the character indities of the compound and without ap reciably increasing the cost of the eompoun or causing it to injure the soft-rubber bag, pillow, or other receptacle; furthermore, to secure a longer heat-imparting capacity than in any other compound used for similar purposes.
In order to accomplish the object set forth, I depart radically from the methods heretofore devised to produce a soft crystal by discarding the use of non-crystalline substances of the character indicated or of poisonous cl' \'slalline salts and employin a non-poisom ous crystalline substance. The soft crystalline non-poisonous substance which I prefer to combine with the heat-storing crystal in order to induce the formation of crystals which will he su'lliciently soft to prevent serious iuj cry to the indie-rubber receptacle and to secure the long heat-imparting capacity is chlorid of calcium.
By reason of the fact that the chlorid of calcium such as employed costs but little the improved heat-storing compound of this invention is comparatively inexpensive to produce and costs less than any other thermophoric mixture or heat-storing com ound. urthermore, it is found in practice t lat the improved compound of this invention, consisting, as it does, of only nonpoisonous crystalline substances, does not menace the health of the user nor in'uriously affect the rece tools in which it is laced.
hile the addition of t e chlorid of calcium or other suitable soft crystalline substance to the sodium acetate, sodium hyposulfite, or other suitable heat-storing salt m sulliciently large quantities to produce a comparatively soft crystal does not materially afi'ect the heat-storing qualities of the sodium acetate and the like, it is found in practice that by adding a larger quantity of the soft crystalline substance than is actually needed to produce a soft crystal the heat-storing quality of the sodium acetate or similar ingredient can be modified at will to produce any desired temperature in the bag, pillow, or other recepta lIO - has been ole-that is to as by way of example, if the tern ature. of e compound consisting of a soil d rystalline substance, such as chlond of calcium and a heat-storing s ubstance when mixed in suitable proportlon 1e55 centigrade and it is desired to produce a lower tem ature a much larger pro ortion of the c orid of calcium, which Is evoid of heat storing properties can be mixed with the sodium acetate or the like, it being understood that in order to lower the tem rature as indicated a larger proportion of t e chlorid of calcium than is actually needed to produce a soft ci'ystadl in the heat-storing compound is emp o e v am aware that a heat-storing compound reduced heretofore by the use of acetate 0 lead,and I make no claim thereto. Acetate of lead is ob'ectionable because of its poisonous nature. y invention residesin the combination, with a heat storing salt, of a a nonoisonous soft crystalline substance-- such, or example, as chlorld. of calclum.
Having described the invention, what is claimed as new isz 5 l. A heat-etc compound consisting of acetate of soda an chlond of calcium.
2. A heat-ate com und consisting of acetate of soda, 0 orid 0 calcium and hypos'ulfite of soda. 3o
3. A heat-storing com ound consisting of a heat-storing salt, and c orid of calcium.
4. A heat-storing compound consisting of a heat-storing salt and a non-poisonous, soft, crystalline substance, adapted to cause the formation of a comparatlvel soft crystal and to regulate the amount of eat to be generated by the compound without producing a poisonous mixture.
In testimony whereof I aflix my signature 40 in presence of two witnesses.
FREDERIC OTTO SPIESKE. Witnesses:
James F. DUHAMEL, W. H. CLABKE.