The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 14, 1978
Filed:
Oct. 13, 1976
Applicant:
Inventors:
Toshihiko Nakayama, Tokorozawa, JA;
Isao Koyama, Kodaira, JA;
Hisao Wakabayashi, Higashikurume, JA;
Hiroshi Hishida, Sayama, JA;
Assignee:
Citizen Watch Co., Ltd., Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
310360 ; 310369 ; 310348 ;
Abstract
An improved AT-cut crystal oscillator for electronic watches. The AT-cut crystal oscillator is of substantially disc-shape. Furthermore, the AT-cut crystal oscillator is shaped in cross-section such that the periphery of the disc-shaped crystal oscillator is abruptly tapered. In the preferred embodiment, the cross-section is trapezoidal.