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Patent US2667692A successfully refreshed from Google Patents.
US2667692A
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Assignee: Individual
•
Filing: 1951-11-23
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Granted: 1954-02-02
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Expires: 1971-11-23
Abstract
No abstract record available.
Inventors
- 👤 Douglas J Leafstrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:29
CPC Classifications
F; F41; F41G; F41G1/00; F41G1/46; F41G1/467
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1340453A
Cited
US1485064A
Cited
US2351103A
Cited
US2461122A
Cited
US2458510A
Cited
US2574599A
Cited
US2559927A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-02-01 | 1957-08-03 | 1958-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-02-01 | 1961-08-03 | 1962-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-02-01 | 1965-08-03 | 1966-02-02 | $7700.00 | Window Closed / Lapsed |