Cylindrical crystal resonator
CA 1237491 A · Owner: The Government Of The United States As Represented By The Secretary Of T He Army · Inventors: Ballato, Arthur
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Improvement of resonator circuit parameters unwanted, mode suppression, and the frequency-temperature characteristic of a crystal resonator is provided by a doubly cut crystal resonator plate having at least one major face including a cylindrical contour, the axis of which is parallel to the direction of the projection of the eigenvector (the normal coordinate) for the desired operating mode. The cylinder axis is at an angle to the doubly rotated electrical axis such that the fast shear"b"mode is suppressed while the slow shear"c"mode is unaffected. The radius of the cylinder is selectively chosen for altering the frequency-temperature characteristic.
Read the whole patent
Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted May 31, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 31, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.