Patent US4477952A successfully refreshed from Google Patents.
US4477952A
Expired / Lapsed
US
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Piezoelectric crystal electrodes and method of manufacture
Assignee: Ericsson Inc
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Filing: 1983-04-04
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Granted: 1984-10-23
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Expires: 2003-04-04
Abstract
Abstract An improved crystal is provided with an aluminum baseplate, a nickel plating on the aluminum baseplate, and a silver plating on the nickel plating. The nickel is plated on the aluminum baseplate before the aluminum has oxidized to provide high yields of stable crystals.
Inventors
- 👤 Robert J. Crescenzi
- 👤 John U. Daniels, Jr.
- 👤 Gerald E. Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:27
CPC Classifications
H; H10; H10N; H10N30/00; H10N30/01; H10N30/06; Y; Y10; Y10T; Y10T29/00; Y10T29/42; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12736; Y10T428/1275; Y10T428/12771; Y10T428/12861; Y10T428/12896; Y10T428/12944
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
102 words
A method for providing electrodes on a piezoelectric crystal comprising: a. depositing an aluminum baseplate on said crystal in a relatively high vacuum on at least a portion of a first surface of said crystal; b. depositing a nickel plating on said aluminum baseplate before said aluminum baseplate is exposed to an active atmosphere and while said relatively high vacuum is maintained; c. removing said crystal, with said aluminum and nickel platings, from said vacuum and connecting leads to said nickel plating; d. and depositing a frequency plating selected from silver or gold on said nickel plating in a relatively high vacuum.
Claim 2
Independent Claim
102 words
A method for providing electrodes on a piezoelectric crystal comprising: a. depositing an aluminum baseplate on said crystal in a relatively high vacuum on at least a portion of a first surface of said crystal; b. depositing a nickel plating on said aluminum baseplate before said aluminum baseplate is exposed to an active atmosphere and while said relatively high vacuum is maintained; c. removing said crystal, with said aluminum and nickel platings, from said vacuum and connecting leads to said nickel plating; d. and depositing a frequency plating selected from silver or gold on said nickel plating in a relatively high vacuum.
Claim 3
Dependent Claim
20 words
The method of claim 1, and comprising the further step of curing said leads prior to depositing said frequency plating.
Claim 4
Dependent Claim
30 words
The method of claim 1, and comprising the further step of electroplating nickel on said previously deposited nickel plating after connecting said leads and prior to depositing said frequency plating.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |