US1661131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expansible-collapsible element
Assignee: Detroit Lubricator Co
•
Filing: 1926-04-29
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Granted: 1928-02-28
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Expires: 1946-04-29
Abstract
No abstract record available.
Inventors
- 👤 Duffield George Bethune
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:13
CPC Classifications
F; F16; F16J; F16J3/00; F16J3/04; F16F; F16F9/00; F16F9/02; F16F9/04; F16L; F16L51/00; F16L51/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1931-02-27 | 1931-08-29 | 1932-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1935-02-27 | 1935-08-29 | 1936-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1939-02-27 | 1939-08-29 | 1940-02-28 | $7700.00 | Window Closed / Lapsed |