US2523975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Periscope spectacles
Assignee: Individual
•
Filing: 1948-07-12
•
Granted: 1950-09-26
•
Expires: 1968-07-12
Abstract
No abstract record available.
Inventors
- 👤 Le Roy E Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:29
CPC Classifications
G; G02; G02C; G02C7/00; G02C7/14; G02B; G02B23/00; G02B23/02; G02B23/08; G02C9/00; G02C9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191502345A
Cited
GB191504397A
Cited
US1521339A
Cited
US1610553A
Cited
US1751567A
Cited
US1884137A
Cited
CH204557A
Cited
US2255197A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-25 | 1954-03-27 | 1954-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-25 | 1958-03-27 | 1958-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-25 | 1962-03-27 | 1962-09-26 | $7700.00 | Window Closed / Lapsed |