Patent SE420459B successfully refreshed from Google Patents.
US3257902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical system having cylindrical rod-like lenses
Assignee: W Watson and Sons Ltd
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Filing: 1960-07-14
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Granted: 1966-06-28
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Expires: 1980-07-14
Abstract
No abstract record available.
Inventors
- 👤 Hopkins Harold Horace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:29
CPC Classifications
A; A61; A61B; A61B1/00; A61B1/04; A61B1/055; G; G02; G02B; G02B17/00; G02B17/02; G02B23/00; G02B23/24; G02B23/2407; G02B23/2446
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
AN OPTICAL SYSTEM FOR FORMING AN OPTICAL IMAGE OF AN OBJECT WHICH OPTICAL SYSTEM COMPRISES A FIRST CYLINDRICAL ROD-LIKE BICONVEX LENS HAVING A CONVEX ENTRY FACE AND A CONVEX EXIT FACE, A SECOND CYLINDRICAL ROD-LIKE BICONVEX LENS, EACH LENS INCLUDING A CORRECTING COMPONENT WITH DIFFERENT REFRACTIVE INDEX THEN THE FIRST LENS FORMING THEREWITH A COMPOUND LENS HAVING A CONVEX ENTRY FACE AND A CONVEX EXIT FACE, THE LENSES HAVING A COMMON OPTICAL AXIS AND THE ENTRY FACE OF THE SECOND LENS BEING SEPARATED FROM THE EXIT FACE OF THE FIRST LENS BY A SPACE WHICH CONTAINS A GAS, THE LENSES BEING ARRANGED SYMMETRICALLY ABOUT THE SAID SPACE, THE AXIAL THICKNESS OF EACH LENS BEING SUBSTANTIALLY GREATER THAN THE DIAMETER OF THAT LENS AND GREATER THAN THE AXIAL THICKNESS OF THE SAID SPACE.
Claim 2
Dependent Claim
132 words
AN OPTICAL SYSTEM FOR FORMING AN OPTICAL IMAGE OF AN OBJECT WHICH OPTICAL SYSTEM COMPRISES A FIRST CYLINDRICAL ROD-LIKE BICONVEX LENS HAVING A CONVEX ENTRY FACE AND A CONVEX EXIT FACE, A SECOND CYLINDRICAL ROD-LIKE BICONVEX LENS, EACH LENS INCLUDING A CORRECTING COMPONENT WITH DIFFERENT REFRACTIVE INDEX THEN THE FIRST LENS FORMING THEREWITH A COMPOUND LENS HAVING A CONVEX ENTRY FACE AND A CONVEX EXIT FACE, THE LENSES HAVING A COMMON OPTICAL AXIS AND THE ENTRY FACE OF THE SECOND LENS BEING SEPARATED FROM THE EXIT FACE OF THE FIRST LENS BY A SPACE WHICH CONTAINS A GAS, THE LENSES BEING ARRANGED SYMMETRICALLY ABOUT THE SAID SPACE, THE AXIAL THICKNESS OF EACH LENS BEING SUBSTANTIALLY GREATER THAN THE DIAMETER OF THAT LENS AND GREATER THAN THE AXIAL THICKNESS OF THE SAID SPACE.
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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) | 1969-06-27 | 1969-12-27 | 1970-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-27 | 1973-12-27 | 1974-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $7700.00 | Window Closed / Lapsed |