US2653237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pulse lengthening circuit
Assignee: Individual
•
Filing: 1946-06-06
•
Granted: 1953-09-22
•
Expires: 1966-06-06
Abstract
No abstract record available.
Inventors
- 👤 Charles W Johnstone
- 👤 Harold V Hance
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:34
CPC Classifications
H; H03; H03K; H03K5/00; H03K5/01; H03K5/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2241256A
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US2405843A
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US2350069A
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US2489824A
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US2411573A
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US2419340A
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US2589085A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-09-21 | 1957-03-23 | 1957-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-09-21 | 1961-03-23 | 1961-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-09-21 | 1965-03-23 | 1965-09-22 | $7700.00 | Window Closed / Lapsed |