US2867152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system comprising two lens elements with one element having two separated concentric surfaces
Assignee: Individual
•
Filing: 1956-05-28
•
Granted: 1959-01-06
•
Expires: 1976-05-28
Abstract
No abstract record available.
Inventors
- 👤 Boolsky-Bogopolsky Raphael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:48
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US35605A
Cited
US554737A
Cited
US562614A
Cited
US775353A
Cited
FR510835A
Cited
US2063178A
Cited
US2388119A
Cited
US2656761A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-01-05 | 1962-07-07 | 1963-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-05 | 1966-07-07 | 1967-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-05 | 1970-07-07 | 1971-01-06 | $7700.00 | Window Closed / Lapsed |