Patent US3143444A successfully refreshed from Google Patents.
US3143444A
Expired / Lapsed
US
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Semi-conductor devices
Assignee: ZF International UK Ltd
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Filing: 1961-10-20
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Granted: 1964-08-04
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Expires: 1981-10-20
Abstract
No abstract record available.
Inventors
- 👤 Lowe Ronald Charles
- 👤 Hughes Thomas Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 18:36
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/60; C; C30; C30B; C30B31/00; C30B31/06; H10D10/00; H10D62/80; H10D62/83; H10D62/834; H10D99/00; H10P; H10P32/00; H10P32/10; H10P32/12; H10P32/17; H10P32/171; H10P95/00; Y; Y10; Y10S; Y10S438/00; Y10S438/914; Y10S438/92; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12528
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) | 1967-08-04 | 1968-02-03 | 1968-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-04 | 1972-02-03 | 1972-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-04 | 1976-02-03 | 1976-08-04 | $7700.00 | Window Closed / Lapsed |