US2931669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansion compensator with anti-torque device
Assignee: Individual
•
Filing: 1956-10-22
•
Granted: 1960-04-05
•
Expires: 1976-10-22
Abstract
No abstract record available.
Inventors
- 👤 Frank A Mcdonald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:52
CPC Classifications
F; F16; F16L; F16L51/00; F16L51/02; F16L51/025; F16L51/027; F16L51/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1726483A
Cited
US1354706A
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US1355946A
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US1786506A
Cited
US2317598A
Cited
GB544805A
Cited
US2565296A
Cited
GB658505A
Cited
US2678228A
Cited
US2758612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-04-05 | 1963-10-05 | 1964-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-05 | 1967-10-05 | 1968-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-05 | 1971-10-05 | 1972-04-05 | $7700.00 | Window Closed / Lapsed |