US2538955A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nondirectional isolator unit
Assignee: M B Manufacturing Co Inc
•
Filing: 1946-05-01
•
Granted: 1951-01-23
•
Expires: 1966-05-01
Abstract
No abstract record available.
Inventors
- 👤 Phillip C Efromson
- 👤 Robert C Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:07
CPC Classifications
F; F16; F16F; F16F1/00; F16F1/36; F16F1/373; F16F1/3732
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2023756A
Cited
US2179959A
Cited
US2245295A
Cited
US2261955A
Cited
US2310832A
Cited
US2262443A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-01-22 | 1954-07-24 | 1955-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-22 | 1958-07-24 | 1959-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-22 | 1962-07-24 | 1963-01-23 | $7700.00 | Window Closed / Lapsed |