US2421022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duration impulse receiver
Assignee: Individual
•
Filing: 1945-01-04
•
Granted: 1947-05-27
•
Expires: 1965-01-04
Abstract
No abstract record available.
Inventors
- 👤 Oliver T Francis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:57
CPC Classifications
H; H03; H03K; H03K9/00; H03K9/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1597763A
Cited
US1695840A
Cited
US1637080A
Cited
US1812187A
Cited
US1956670A
Cited
US2083849A
Cited
US2276680A
Cited
US2334575A
Cited
GB545399A
Cited
US2350551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-05-26 | 1950-11-25 | 1951-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-05-26 | 1954-11-25 | 1955-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-05-26 | 1958-11-25 | 1959-05-27 | $7700.00 | Window Closed / Lapsed |