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:
Apr. 19, 1994
Filed:
Jul. 28, 1992
Applicant:
Inventors:
Rudolf A Heinecke, Harlow, GB;
Roger J Williamson, Harlow, GB;
Assignee:
Northern Telecom Limited, Montreal, CA;
Primary Examiner:
Int. Cl.
CPC ...
H01L / ; H01L / ;
U.S. Cl.
CPC ...
310361 ; 310369 ;
Abstract
A resonator comprises a quartz resonator element (11) sealed between a pair of flat quartz housing members (12, 13) the resonator comprises an active central region 110 defined by an annular recess 111 within which vibrational energy is trapped. The crystal orientation of the housing may be aligned with that of the resonator to minimise thermal effects.