US2674920A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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Assignee: THREE DIMENSION Co
•
Filing: 1952-07-17
•
Granted: 1954-04-13
•
Expires: 1972-07-17
Abstract
No abstract record available.
Inventors
- 👤 Frank P Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:47
CPC Classifications
G; G02; G02B; G02B30/00; G02B30/20; G02B30/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1781945A
Cited
US1796432A
Cited
US2003480A
Cited
US2276735A
Cited
US2590260A
Cited
FR990775A
Cited
FR992062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-12 | 1957-10-12 | 1958-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-12 | 1961-10-12 | 1962-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-12 | 1965-10-12 | 1966-04-13 | $7700.00 | Window Closed / Lapsed |