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Publication numberUS1172918 A
Publication typeGrant
Publication dateFeb 22, 1916
Filing dateNov 23, 1914
Priority dateNov 23, 1914
Publication numberUS 1172918 A, US 1172918A, US-A-1172918, US1172918 A, US1172918A
InventorsCharles J Thorp
Original AssigneeCharles J Thorp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Artificial tooth-crown.
US 1172918 A
Abstract  available in
Previous page
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Claims  available in
Description  (OCR text may contain errors)



APPLICATION FILED nov. 23. 1914.

1, 1 72,9 1 8, Patented Feb. 22, 1916.



Specification of Letters Patent.

Patented Feb. 22, 1916.

Application filed November 23, 1914. Serial No. 873,428.

To all whom it may concern Be, it known that I, CHARLES J. THoRP, a citizen of the United States of America, residing at Detroit, in the county of lVayne and State of Michigan, have invented certain new and useful Improvements in Artificial Tooth-Crowns, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to an artificial tooth crown and has for its object a tooth crown of composite metal of gold and silver.

Reference will now be had to the drawing, wherein Figure 1 is a plan of a composite plate produced for artificial tooth crowns; Fig. 2 is a side elevation of the same; Fig. 3 is a plan of a disk cut and stamped from the plate shown in Figs. 1 and 2; and Fig. 4 is a vertical sectional View of a tooth crown or shell produced by stamping and cupping the disk shown in Fig. 3.

A sheet of gold is placed upon a sheet of silver, the metallic sheets being designated 1 and 2 respectively. The sheets are subjected to the action of heat and then to a rolling action with sufiicient pressure brought to bear to make the gold and silver sheets practically integral.

From the composite plate or sheet thus produced one or more disks 3 can be cut and stamped and then the disk projected to the action of dies or forming members whereby the disk is cupped to form a crown or shell 4 having a silver lining.

By my improvement the silver which forms a lining of the crown or shell prevents the mercury in amalgam from affecting the gold of the crown or shell, consequently the longevity of a crown in accordance with my invention is materially increased. Furthermore the grinding surface or bicuspid of the crown or shell can be easily renewed if worn. These and many other advantages are gained by combining gold and silver as above set forth. and while in the drawing there has been illustrated a blank crown or shell, it is to be understood that the shell can be shaped or swaged to fit various organs.

What I claim is As a new article of manufacture, a tooth crown of composite metal of gold and silver.

In testimony whereof I afliX my signature in presence of two witnesses.




Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4459112 *Sep 2, 1982Jul 10, 1984Itzhak ShoherDental jacket crown, coping and method of forming a crown
US4492579 *Apr 22, 1983Jan 8, 1985Itzhak ShoherDental jacket crown, coping and method of construction
US4980124 *Jun 29, 1989Dec 25, 1990Dimmer David CDental restoration and method for its production
USRE33099 *Jun 4, 1986Oct 24, 1989 Dental crown, coping and method
USRE33271 *Dec 6, 1985Jul 24, 1990 Dental jacket crown, coping and method of construction
U.S. Classification433/222.1
Cooperative ClassificationA61C13/0003