Patent US4242719A successfully refreshed from Google Patents.
Patent US3185031A successfully refreshed from Google Patents.
US3185031A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Symmetrical projection objective
Assignee: Bausch and Lomb Inc
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Filing: 1962-09-04
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Granted: 1965-05-25
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Expires: 1982-09-04
Abstract
No abstract record available.
Inventors
- 👤 Ellis I Betensky
- 👤 Rickless Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:54
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A SYMMETRICAL PROJECTION OBJECTIVE FOR COPYING AND PROCESS WORK SUBSTANTIALLY AT UNITY MAGNIFICATION COMPRISING A PAIR OF DOUBLE CONVEX LENSES, IN MUTUAL OPTICAL ALIGNMENT AND SPACED APART, A PAIR OF DOUBLE CONCAVE LENSES, OPTICALLY ALIGNED BETWEEN AND SPACED FROM THE DOUBLE CONVEX LENSES, AND A PAIR OF MENISCUS LENSES ALIGNED BETWEEN AND SPACED FROM SAID DOUBLE CONCAVE LENSES ON OPPOSITE SIDES OF A CENTRAL DIAPHRAGM, EACH MENISCUS LENS HAVING A CONCAVE SURFACE FACING SAID DIAPHRAGM. THE VALUES OF RADII, WHICH ARE DESIGNATED R1 TO R12 OF THE SUCCESSIVE LENS SURFACES, NUMBERING FROM THE ENTRANT SIDE OF THE OBJECTIVE AND DESIGNATING THOSE SURFACES WHICH ARE CONCAVE TO THE ENTRANT RAYS BY A MINUS SIGN, BEING GIVEN IN THE TABLE OF MATHEMATICAL STATEMENTS HEREBELOW ALONG WITH THE VALUES OF THE SUCCESSIVE LENS THICKNESSES WHICH ARE DESIGNATED T1 TO T6, AND THE VALUES OF THE SUCCESSIVE LENS SPACINGS WHICH ARE DESIGNATED S1 TO S6, AND FURTHER SPECIFYING THE REFRACTIVE INDEX ND AND ABBE NUMBER V FOR THE LENS MATERIALS OF THE SUCCESSIVE LENS I TO VI,
Claim 2
Dependent Claim
173 words
A SYMMETRICAL PROJECTION OBJECTIVE FOR COPYING AND PROCESS WORK SUBSTANTIALLY AT UNITY MAGNIFICATION COMPRISING A PAIR OF DOUBLE CONVEX LENSES, IN MUTUAL OPTICAL ALIGNMENT AND SPACED APART, A PAIR OF DOUBLE CONCAVE LENSES, OPTICALLY ALIGNED BETWEEN AND SPACED FROM THE DOUBLE CONVEX LENSES, AND A PAIR OF MENISCUS LENSES ALIGNED BETWEEN AND SPACED FROM SAID DOUBLE CONCAVE LENSES ON OPPOSITE SIDES OF A CENTRAL DIAPHRAGM, EACH MENISCUS LENS HAVING A CONCAVE SURFACE FACING SAID DIAPHRAGM. THE VALUES OF RADII, WHICH ARE DESIGNATED R1 TO R12 OF THE SUCCESSIVE LENS SURFACES, NUMBERING FROM THE ENTRANT SIDE OF THE OBJECTIVE AND DESIGNATING THOSE SURFACES WHICH ARE CONCAVE TO THE ENTRANT RAYS BY A MINUS SIGN, BEING GIVEN IN THE TABLE OF MATHEMATICAL STATEMENTS HEREBELOW ALONG WITH THE VALUES OF THE SUCCESSIVE LENS THICKNESSES WHICH ARE DESIGNATED T1 TO T6, AND THE VALUES OF THE SUCCESSIVE LENS SPACINGS WHICH ARE DESIGNATED S1 TO S6, AND FURTHER SPECIFYING THE REFRACTIVE INDEX ND AND ABBE NUMBER V FOR THE LENS MATERIALS OF THE SUCCESSIVE LENS I TO VI,
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) | 1968-05-24 | 1968-11-23 | 1969-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-24 | 1972-11-23 | 1973-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-24 | 1976-11-23 | 1977-05-25 | $7700.00 | Window Closed / Lapsed |