US2998575A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High precision frequency standard comprising silicon or germanium crystal element
Assignee: AT&T Inc
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Filing: 1958-04-29
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Granted: 1961-08-29
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Expires: 1978-04-29
Abstract
No abstract record available.
Inventors
- 👤 Warren P Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:31
CPC Classifications
G; G04; G04F; G04F5/00; G04F5/04; G04F5/06; H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/34; H03H; H03H3/00; H03H3/007; H03H3/02; H03H3/04
Claims Analysis
Total Claims: 0
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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) | 1964-08-28 | 1965-02-27 | 1965-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-08-28 | 1969-02-27 | 1969-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-08-28 | 1973-02-27 | 1973-08-29 | $7700.00 | Window Closed / Lapsed |