US2608129A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-mirror telescope focusing system
Assignee: Northrop Grumman Corp
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Filing: 1951-03-26
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Granted: 1952-08-26
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Expires: 1971-03-26
Abstract
No abstract record available.
Inventors
- 👤 Philip H Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:22
CPC Classifications
G; G02; G02B; G02B17/00; G02B17/08; G02B17/0884; G02B17/0804; G02B17/0808; G02B23/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A TELESCOPE CONSISTING OF A MENISCUS LENS CONCAVE TOWARD A LIGHT SOURCE AND A CONCAVE MIRROR SURFACE SPACED BEHIND SAID LENS AND FACING SAID LENS, THE FRONT AND BACK SURFACES OF SAID LENS AND SAID MIRROR SURFACE BEING SPHERICAL AND HAVING A COMMON CENTER OF CURVATURE AHEAD OF SAID LENS, THE BACK SURFACE OF SAID LENS HAVING AN AXIAL REFLECTING SPOT, SAID MIRROR SURFACE HAVING AN AXIAL LIGHT TRANSMITTING SPOT WHEREBY LIGHT FROM SAID SOURCE PASSES THROUGH SAID LENS OUTSIDE OF SAID REFLECTING SPOT IS REFLECTED BY SAID MIRROR SURFACE TO SAID REFLECTING SPOT AND IS REFLECTED THEREBY THROUGH SAID LIGHT TRANSMITTING SPOT TO AN IMAGE PLANE BEHIND SAID MIRROR SURFACE, SAID TELESCOPE HAVING THE FOLLOWING PRESCRIPTION: R1=-53.20 D1= 1.00 BOROSILICATE CROWN GLASS R2=-54.20 D2= 25.80 R3=-80.00 SHPERICAL MIRROR (PYREX OR FUSED QUARTZ) D3=-25.80 R4=-54.20 SHPERICAL MIRROR L''= 30.67 FOCAL LENGTH= 85 INCHES WHERE D IS AXIAL DISTANCE IN INCHES; R IS THE RADIUS OF A SURFACE; L'' IS THE AXIAL DISTANCE FROM THE LAST SURFACE TO THE IMAGE PLANE.
Claim 2
Dependent Claim
170 words
A TELESCOPE CONSISTING OF A MENISCUS LENS CONCAVE TOWARD A LIGHT SOURCE AND A CONCAVE MIRROR SURFACE SPACED BEHIND SAID LENS AND FACING SAID LENS, THE FRONT AND BACK SURFACES OF SAID LENS AND SAID MIRROR SURFACE BEING SPHERICAL AND HAVING A COMMON CENTER OF CURVATURE AHEAD OF SAID LENS, THE BACK SURFACE OF SAID LENS HAVING AN AXIAL REFLECTING SPOT, SAID MIRROR SURFACE HAVING AN AXIAL LIGHT TRANSMITTING SPOT WHEREBY LIGHT FROM SAID SOURCE PASSES THROUGH SAID LENS OUTSIDE OF SAID REFLECTING SPOT IS REFLECTED BY SAID MIRROR SURFACE TO SAID REFLECTING SPOT AND IS REFLECTED THEREBY THROUGH SAID LIGHT TRANSMITTING SPOT TO AN IMAGE PLANE BEHIND SAID MIRROR SURFACE, SAID TELESCOPE HAVING THE FOLLOWING PRESCRIPTION: R1=-53.20 D1= 1.00 BOROSILICATE CROWN GLASS R2=-54.20 D2= 25.80 R3=-80.00 SHPERICAL MIRROR (PYREX OR FUSED QUARTZ) D3=-25.80 R4=-54.20 SHPERICAL MIRROR L''= 30.67 FOCAL LENGTH= 85 INCHES WHERE D IS AXIAL DISTANCE IN INCHES; R IS THE RADIUS OF A SURFACE; L'' IS THE AXIAL DISTANCE FROM THE LAST SURFACE TO THE IMAGE PLANE.
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) | 1955-08-26 | 1956-02-25 | 1956-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-08-26 | 1960-02-25 | 1960-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-08-26 | 1964-02-25 | 1964-08-26 | $7700.00 | Window Closed / Lapsed |