Patent US2607843A successfully refreshed from Google Patents.
Patent US3443858A successfully refreshed from Google Patents.
US3443858A
Expired / Lapsed
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Infinite optical image-forming apparatus
Assignee: Farrand Optical Co Inc
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Filing: 1966-02-23
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Granted: 1969-05-13
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Expires: 1986-02-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph La Russa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:05
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/01; G02B27/28; G02B27/0101; G02B2027/0118; G02B2027/012; G02B5/00; G02B5/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IMAGE-FORMING APPARATUS COMPRISING A BEAM-SPLITTING CURVED MIRROR, A FIRST QUARTER-WAVE PLATE DISPOSED ON THE CONCAVE SIDE OF THE CURVED MIRROR, A SECOND BEAMSPLITTING MIRROR DISPOSED ON THE SIDE OF THE FIRST QUARTERWAVE PLATE REMOTE FROM THE CURVED MIRROR, A SECOND QUARTER-WAVE PLATE DISPOSED ON THE SIDE OF THE SECOND BEAM-SPLITTING MIRROR REMOTE FROM THE FIRST QUARTER-WAVE PLATE, AND A POLARIZER DISPOSED ON THE SIDE OF THE SECOND QUARTER-WAVE PLATE REMOTE FROM THE SECOND BEAM-SPLITTING MIRROR, THE FIRST AND SECOND QUARTER-WAVE PLATES HAVING THEIR FAST AXES ORIENTED WITH RESPECT TO EACH OTHER AT
Claim 2
Dependent Claim
92 words
IMAGE-FORMING APPARATUS COMPRISING A BEAM-SPLITTING CURVED MIRROR, A FIRST QUARTER-WAVE PLATE DISPOSED ON THE CONCAVE SIDE OF THE CURVED MIRROR, A SECOND BEAMSPLITTING MIRROR DISPOSED ON THE SIDE OF THE FIRST QUARTERWAVE PLATE REMOTE FROM THE CURVED MIRROR, A SECOND QUARTER-WAVE PLATE DISPOSED ON THE SIDE OF THE SECOND BEAM-SPLITTING MIRROR REMOTE FROM THE FIRST QUARTER-WAVE PLATE, AND A POLARIZER DISPOSED ON THE SIDE OF THE SECOND QUARTER-WAVE PLATE REMOTE FROM THE SECOND BEAM-SPLITTING MIRROR, THE FIRST AND SECOND QUARTER-WAVE PLATES HAVING THEIR FAST AXES ORIENTED WITH RESPECT TO EACH OTHER AT
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-12 | 1972-11-11 | 1973-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-12 | 1976-11-11 | 1977-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-12 | 1980-11-11 | 1981-05-13 | $7700.00 | Window Closed / Lapsed |