US2680574A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cassette
Assignee: Individual
•
Filing: 1950-02-13
•
Granted: 1954-06-08
•
Expires: 1970-02-13
Abstract
No abstract record available.
Inventors
- 👤 Donald E Grove
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:22
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/28; G03B17/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR572374A
Cited
US1561945A
Cited
US1657755A
Cited
US1819337A
Cited
US1829332A
Cited
US2005404A
Cited
US2166543A
Cited
US2218966A
Cited
US2395590A
Cited
US2464673A
Cited
US2476996A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-06-07 | 1957-12-07 | 1958-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-06-07 | 1961-12-07 | 1962-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-06-07 | 1965-12-07 | 1966-06-08 | $7700.00 | Window Closed / Lapsed |