US3274886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cassegrain tele-objective
Assignee: SCANOPTIC Inc
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Filing: 1962-08-21
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Granted: 1966-09-27
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Expires: 1982-08-21
Abstract
No abstract record available.
Inventors
- 👤 Rosin Seymour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:30
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0852; G02B17/0804; G02B17/0808
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A TELE-OBJECTIVE COMPRISING, IN COMBINATION, A PRIMARY MIRROR HAVING A PARABOLIC REFLECTING SURFACE CONCAVE TO THE FRONT, AND BEING FORMED WTH AN APERTURE; A SECONDARY MIRROR HAVING A SPHERICAL REFLECTING SURFACE CONVEX TO THE REAR AND CONFRONTING SAID PARABOLIC REFLECTING SURFACE, SAID MIRRORS BEING ALIGNED ALONG AN OPTICAL AXIS, THE DIAMETER OF SAID SECONDARY MIRROR BEING SMALLER THAN THE DIAMETER OF SAID PRIMARY MIRROR; THE RADIUS OF THE ENTIRE SPHERICAL REFLECTING SURFACE BEING EQUAL TO THE RADIUS OF CURVATURE OF THE CENTRAL PORTION OF SAID PARABOLIC REFLECTING SURFACE SO THAT SAID PRIMARY AND SECONDARY MIRRORS HAVE THE SAME FOCAL LENGTH, THE DISTANCE BETWEEN SAID REFLECTING SURFACES BEING GREATER THAN HALF OF SAID FOCAL LENGTH SO THAT THE IMAGE PLANE IS LOCATED REARWARDLY OF SAID PRIMARY MIRROR AND OUTWARDLY OF THE AIR SPACE
Claim 2
Dependent Claim
132 words
A TELE-OBJECTIVE COMPRISING, IN COMBINATION, A PRIMARY MIRROR HAVING A PARABOLIC REFLECTING SURFACE CONCAVE TO THE FRONT, AND BEING FORMED WTH AN APERTURE; A SECONDARY MIRROR HAVING A SPHERICAL REFLECTING SURFACE CONVEX TO THE REAR AND CONFRONTING SAID PARABOLIC REFLECTING SURFACE, SAID MIRRORS BEING ALIGNED ALONG AN OPTICAL AXIS, THE DIAMETER OF SAID SECONDARY MIRROR BEING SMALLER THAN THE DIAMETER OF SAID PRIMARY MIRROR; THE RADIUS OF THE ENTIRE SPHERICAL REFLECTING SURFACE BEING EQUAL TO THE RADIUS OF CURVATURE OF THE CENTRAL PORTION OF SAID PARABOLIC REFLECTING SURFACE SO THAT SAID PRIMARY AND SECONDARY MIRRORS HAVE THE SAME FOCAL LENGTH, THE DISTANCE BETWEEN SAID REFLECTING SURFACES BEING GREATER THAN HALF OF SAID FOCAL LENGTH SO THAT THE IMAGE PLANE IS LOCATED REARWARDLY OF SAID PRIMARY MIRROR AND OUTWARDLY OF THE AIR SPACE
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-09-26 | 1970-03-28 | 1970-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-26 | 1974-03-28 | 1974-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-26 | 1978-03-28 | 1978-09-27 | $7700.00 | Window Closed / Lapsed |