US2437551A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic control system
Assignee: Penn Electric Switch Co
•
Filing: 1944-02-25
•
Granted: 1948-03-09
•
Expires: 1964-02-25
Abstract
No abstract record available.
Inventors
- 👤 Penn Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:24
CPC Classifications
F; F01; F01P; F01P7/00; F01P7/02; F01P7/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1406377A
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US1954142A
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US2069516A
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US2056287A
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GB538182A
Cited
US2334967A
Cited
US2314937A
Cited
US2333066A
Cited
US2348454A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-03-09 | 1951-09-08 | 1952-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-03-09 | 1955-09-08 | 1956-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-03-09 | 1959-09-08 | 1960-03-09 | $7700.00 | Window Closed / Lapsed |