Patent US4413891A successfully refreshed from Google Patents.
US4413891A
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Refractor optical system
Assignee: Leica Microsystems Inc
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Filing: 1980-03-27
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Granted: 1983-11-08
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Expires: 2000-03-27
Abstract
Abstract A refractor optical system having a new series of spherical and cylinder lenses substantially eliminates the irregular occurrence of additive errors when lenses spaced from the reference plane are used or more than two lenses are combined and permits correction for the significant additive errors by non-additive lens selection is disclosed.
Inventors
- 👤 Edward B. Rybicki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 02:06
CPC Classifications
A; A61; A61B; A61B3/00; A61B3/10; A61B3/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
78 words
A lens series for a refractor having a plurality of lenses positionable at each of more than two positions spaced along an optical axis and a reference plane at one of the positions which comprises, the plurality of lenses being positionable at the reference plane including a zero power lens having the same index of refraction, having the same thickness, having the same radius on one surface and the same distance to other lenses on the optical axis.
Claim 2
Dependent Claim
78 words
A lens series for a refractor having a plurality of lenses positionable at each of more than two positions spaced along an optical axis and a reference plane at one of the positions which comprises, the plurality of lenses being positionable at the reference plane including a zero power lens having the same index of refraction, having the same thickness, having the same radius on one surface and the same distance to other lenses on the optical axis.
Claim 3
Dependent Claim
16 words
A lens series according to claim 1 wherein at least some of the lenses are plastic.
Claim 4
Dependent Claim
11 words
The lens series of claim 2 wherein the plastic is polycarbonate.
References Cited (Backward Citations)
US1455457A
Cited
US2266797A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-07 | 1987-05-09 | 1987-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-07 | 1991-05-09 | 1991-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-07 | 1995-05-09 | 1995-11-08 | $7700.00 | Window Closed / Lapsed |