Patent US4198981A successfully refreshed from Google Patents.
US4259607A
Expired / Lapsed
US
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Quartz crystal vibrator using Ni-Ag or Cr-Ni-Ag electrode layers
Assignee: Citizen Watch Co Ltd
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Filing: 1978-06-19
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Granted: 1981-03-31
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Expires: 1998-06-19
Abstract
Abstract A structure of an electrode film deposited on a tuning fork-type quartz crystal vibrator in which an electrode film on a tuning fork-type quartz crystal vibrator has a laminated structure obtained by forming, in the order mentioned, three overlapping layers, namely layers of chrome, nickel and silver, or two overlapping layers, namely layers of nickel and silver, on the surface of a tuning fork-shaped quartz crystal from the side nearest thereto, and in which the thickness of each layer of the electrode film is less than 300 A for the chrome layer, less than 500 A for the nickel layer, and less than 2000 A for the silver layer.
Inventors
- 👤 Kazuo Noguchi
- 👤 Makoto Wakasugi
- 👤 Fumio Kohyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:52
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/21; H03H9/215
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
73 words
A tuning fork-type quartz crystal vibrator comprising: a tuning fork-shaped quartz crystal; and an electrode formed on a surface of said quartz crystal and including a thin nickel film deposited directly on upper and lower surfaces of said quartz crystal, and a silver film deposited on said nickel film, wherein said thin nickel film has a thickness of less than 500 A and said silver film has a thickness less than 2000 A.
Claim 2
Dependent Claim
73 words
A tuning fork-type quartz crystal vibrator comprising: a tuning fork-shaped quartz crystal; and an electrode formed on a surface of said quartz crystal and including a thin nickel film deposited directly on upper and lower surfaces of said quartz crystal, and a silver film deposited on said nickel film, wherein said thin nickel film has a thickness of less than 500 A and said silver film has a thickness less than 2000 A.
Claim 3
Dependent Claim
39 words
A tuning fork-type quartz crystal vibrator as claimed in claim 1, in which said thin nickel film is deposited at a temperature of about 150° C., and said silver film is deposited at a temperature of about 100° C.
Claim 4
Dependent Claim
93 words
A tuning fork-type quartz crystal vibrator comprising: a tuning fork-shaped quartz crystal; and an electrode formed on a surface of said quartz crystal and including a thin chrome film deposited directly on the surface of said quartz crystal, a thin nickel film deposited on said thin chrome film and a silver film deposited on said thin nickel film, wherein said thin chrome film has a thickness of less than 300 A, said nickel film has a thickness of less than 500 A, and said silver film has a thickness less than 2000 A.
Claim 5
Dependent Claim
93 words
A tuning fork-type quartz crystal vibrator comprising: a tuning fork-shaped quartz crystal; and an electrode formed on a surface of said quartz crystal and including a thin chrome film deposited directly on the surface of said quartz crystal, a thin nickel film deposited on said thin chrome film and a silver film deposited on said thin nickel film, wherein said thin chrome film has a thickness of less than 300 A, said nickel film has a thickness of less than 500 A, and said silver film has a thickness less than 2000 A.
Claim 6
Dependent Claim
50 words
A tuning fork-type quartz crystal vibrator as claimed in claim 3, in which said chrome film is deposited at a temperature of about 150° C., said nickel film is deposited at a temperature of about 150° C., and said silver film is deposited at a temperature of about 100° C.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |