Patent US2551972A successfully refreshed from Google Patents.
US2551972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Remote-control system
Assignee: Individual
•
Filing: 1946-11-21
•
Granted: 1951-05-08
•
Expires: 1966-11-21
Abstract
No abstract record available.
Inventors
- 👤 Schaelchlin Walter
- 👤 Jr Amos J Winchester
- 👤 John C Ponstingl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:16
CPC Classifications
G; G05; G05D; G05D1/00; G05D1/0011; G05D1/0033
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2330388A
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US2397088A
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US2400260A
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US2396231A
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US2395693A
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US2404401A
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US2413621A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-05-07 | 1954-11-06 | 1955-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-05-07 | 1958-11-06 | 1959-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-05-07 | 1962-11-06 | 1963-05-08 | $7700.00 | Window Closed / Lapsed |