Patent US4708132A successfully refreshed from Google Patents.
US2798153A
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US
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Switching circuitry
Assignee: Vitro Corp of America
•
Filing: 1953-02-19
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Granted: 1957-07-02
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Expires: 1973-02-19
Abstract
No abstract record available.
Inventors
- 👤 Jr James Gregg Dougherty
- 👤 William L Freienmuth
- 👤 Albert C Armstrong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:29
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/54
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2434929A
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US2443195A
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US2420374A
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US2496909A
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US2542152A
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US2541039A
Cited
US2518341A
Cited
US2703364A
Cited
US2622193A
Cited
US2535303A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-01 | 1960-12-31 | 1961-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-01 | 1964-12-31 | 1965-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-01 | 1968-12-31 | 1969-07-02 | $7700.00 | Window Closed / Lapsed |