US2675769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Contractile-expansible roof support
Assignee: Gamble Brothers Inc
•
Filing: 1952-04-23
•
Granted: 1954-04-20
•
Expires: 1972-04-23
Abstract
No abstract record available.
Inventors
- 👤 Cornelius D Dosker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:52
CPC Classifications
E; E04; E04B; E04B7/00; E04B7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US352424A
Cited
US833358A
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US1160044A
Cited
US1356151A
Cited
US1878992A
Cited
US1727214A
Cited
US1773851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-19 | 1957-10-19 | 1958-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-19 | 1961-10-19 | 1962-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-19 | 1965-10-19 | 1966-04-20 | $7700.00 | Window Closed / Lapsed |