US2638501A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electronic noise suppressor
Assignee: Individual
•
Filing: 1948-11-04
•
Granted: 1953-05-12
•
Expires: 1968-11-04
Abstract
No abstract record available.
Inventors
- 👤 Sidney B Colcman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:17
CPC Classifications
H; H03; H03G; H03G5/00; H03G5/16; H03G5/18; H03G5/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2162875A
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US2323634A
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US2189306A
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US2208665A
Cited
US2247085A
Cited
US2262846A
Cited
US2307308A
Cited
US2361602A
Cited
US2438217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |