US2629645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audience response indicating system
Assignee: SCHWERIN RES CORP
•
Filing: 1947-10-22
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Granted: 1953-02-24
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Expires: 1967-10-22
Abstract
No abstract record available.
Inventors
- 👤 Schwerin Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:50
CPC Classifications
H; H04; H04H; H04H60/00; H04H60/61; H04H60/66; H04H60/35; H04H60/38; H04H60/41; H04H60/43
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2027006A
Cited
US1286234A
Cited
US1678674A
Cited
US2078834A
Cited
US2151579A
Cited
US2223917A
Cited
US2395351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-02-24 | 1956-08-25 | 1957-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-02-24 | 1960-08-25 | 1961-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-02-24 | 1964-08-25 | 1965-02-24 | $7700.00 | Window Closed / Lapsed |