Patent EP0255208A2 successfully refreshed from Google Patents.
Patent US3097255A successfully refreshed from Google Patents.
US3097255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrector for image-forming optical assemblies
Assignee: Individual
•
Filing: 1954-07-16
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Granted: 1963-07-09
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Expires: 1974-07-16
Abstract
No abstract record available.
Inventors
- 👤 John P Farquhar
- 👤 Frank F Crandell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:29
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/0025
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
IN COMBINATION WITH AN IMAGE-FORMING OPTICAL ASSEMBLY HAVING AN OPTICAL AXIS, AN APERTURE STOP AND DISCERNIBLE EXTRA-AXIAL ABERRATION, AN OPTICAL MASK HAVING A CENTRAL OPENING POSITIONED BEHIND THE APERTURE STOP AT A DISTANCE NOT GREATER THAN A LIMITING DISTANCE D1 FROM THE EXIT PUPIL OF SAID ASSEMBLY WHERE
Claim 2
Dependent Claim
48 words
IN COMBINATION WITH AN IMAGE-FORMING OPTICAL ASSEMBLY HAVING AN OPTICAL AXIS, AN APERTURE STOP AND DISCERNIBLE EXTRA-AXIAL ABERRATION, AN OPTICAL MASK HAVING A CENTRAL OPENING POSITIONED BEHIND THE APERTURE STOP AT A DISTANCE NOT GREATER THAN A LIMITING DISTANCE D1 FROM THE EXIT PUPIL OF SAID ASSEMBLY WHERE
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-07-08 | 1967-01-07 | 1967-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-07-08 | 1971-01-07 | 1971-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-07-08 | 1975-01-07 | 1975-07-09 | $7700.00 | Window Closed / Lapsed |