US2540953A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic lens and guard
Assignee: Individual
•
Filing: 1946-09-16
•
Granted: 1951-02-06
•
Expires: 1966-09-16
Abstract
No abstract record available.
Inventors
- 👤 Jr Martin C Kessler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:11
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/022
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US859215A
Cited
US2088262A
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US2314838A
Cited
US2056693A
Cited
GB490381A
Cited
US2332930A
Cited
US2346002A
Cited
US2361589A
Cited
US2330663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-02-05 | 1954-08-07 | 1955-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-02-05 | 1958-08-07 | 1959-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-02-05 | 1962-08-07 | 1963-02-06 | $7700.00 | Window Closed / Lapsed |