US3119892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catadioptric system
Assignee: Farrand Optical Co Inc
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Filing: 1960-07-01
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Granted: 1964-01-28
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Expires: 1980-07-01
Abstract
No abstract record available.
Inventors
- 👤 Shenker Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:36
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
A CATADIOPTRIC IMAGE FORMING SYSTEM COMPRISING, FROM FRONT TO REAR, A POSITIVE MENISCUS LENS, A NEGATIVE MENISCUS LENS, AND A CONCAVE MIRROR, SAID LENSES BEING DISPOSED COAXIALLY TO EACH OTHER IN FRONT OF SAID MIRROR WITH THEIR CONCAVE SURFACES FACING EACH OTHER, THE SUM OF THE POWERS OF THE SURFACES OF EACH OF SAID LENSES LYING IN ABSOLUTE VALUE BETWEEN ZERO AND 0.2 TIMES THE EQUIVALENT POWER OF SAID SYSTEM, THE POWER OF THE REAR SURFACE OF SAID POSITIVE MENISCUS LENS LYING BETWEEN 2.25 AND 12.5 TIMES THE SUM OF THE POWERS OF THE SURFACES OF SAID NEGATIVE MENISCUS LENS, AND THE ABSOLUTE VALUE OF THE RATIO OF THE SUM TO THE DIFFERENCE OF THE RADII OF THE ADJACENT SURFACES OF SAID LENSES LYING BETWEEN ZERO AND 0.45, THE POWER OF THE REAR SURFACE OF SAID NEGATIVE MENISCUS LENS LYING BETWEEN 0.5 AND 1.5 TIMES THE POWER OF THE FRONT SURFACE OF SAID POSITIVE MENISCUS LENS.
Claim 2
Dependent Claim
156 words
A CATADIOPTRIC IMAGE FORMING SYSTEM COMPRISING, FROM FRONT TO REAR, A POSITIVE MENISCUS LENS, A NEGATIVE MENISCUS LENS, AND A CONCAVE MIRROR, SAID LENSES BEING DISPOSED COAXIALLY TO EACH OTHER IN FRONT OF SAID MIRROR WITH THEIR CONCAVE SURFACES FACING EACH OTHER, THE SUM OF THE POWERS OF THE SURFACES OF EACH OF SAID LENSES LYING IN ABSOLUTE VALUE BETWEEN ZERO AND 0.2 TIMES THE EQUIVALENT POWER OF SAID SYSTEM, THE POWER OF THE REAR SURFACE OF SAID POSITIVE MENISCUS LENS LYING BETWEEN 2.25 AND 12.5 TIMES THE SUM OF THE POWERS OF THE SURFACES OF SAID NEGATIVE MENISCUS LENS, AND THE ABSOLUTE VALUE OF THE RATIO OF THE SUM TO THE DIFFERENCE OF THE RADII OF THE ADJACENT SURFACES OF SAID LENSES LYING BETWEEN ZERO AND 0.45, THE POWER OF THE REAR SURFACE OF SAID NEGATIVE MENISCUS LENS LYING BETWEEN 0.5 AND 1.5 TIMES THE POWER OF THE FRONT SURFACE OF SAID POSITIVE MENISCUS LENS.
References Cited (Backward Citations)
US2726574A
Cited
DE1010755B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-01-27 | 1967-07-29 | 1968-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-01-27 | 1971-07-29 | 1972-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-01-27 | 1975-07-29 | 1976-01-28 | $7700.00 | Window Closed / Lapsed |