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:
Sep. 06, 1994
Filed:
Jun. 29, 1988
James A Greer, Andover, MA (US);
Raytheon Company, Lexington, MA (US);
Abstract
A SAW device such as a resonator includes a surface supporting surface wave propagation and a pair of aluminum transducer elements each coupled to said surface wave propagation surface. Each aluminum transducer element is doped with a predetermined amount of silicon. Frequency shifts which result from exposing the SAW device to high temperature cycles as often encountered when packaging the device are reduced, since the silicon present as a dopant in the aluminum will provide an effect on frequency which can be taken into consideration during design and fabrication. These frequency effects will dominate any frequency effects which may result from silicon migration from the substrate to the transducers as a result of the thermal cycling encountered during sealing of the SAW device.