US2711909A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Duffie
Assignee: —
•
Filing: —
•
Granted: 1955-06-28
•
Expires: 1972-06-28
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:56
CPC Classifications
B; B42; B42F; B42F9/00; B42F9/001; B42F15/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US760299A
Cited
US893659A
Cited
US2026796A
Cited
US2173188A
Cited
US2250263A
Cited
US2174660A
Cited
US2428519A
Cited
US2494129A
Cited
US2414183A
Cited
US2538783A
Cited
US2630641A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-06-27 | 1958-12-27 | 1959-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-06-27 | 1962-12-27 | 1963-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-06-27 | 1966-12-27 | 1967-06-28 | $7700.00 | Window Closed / Lapsed |