Patent US3221601A successfully refreshed from Google Patents.
US3221601A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Four component symmetrical projection objective
Assignee: Bausch and Lomb Inc
•
Filing: 1962-07-30
•
Granted: 1965-12-07
•
Expires: 1982-07-30
Abstract
No abstract record available.
Inventors
- 👤 Ellis I Betensky
- 👤 Rickless Nathan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:43
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A SYMMETRICAL PROJECTION OBJECTIVE FOR COPYING AND PROCESS WORK AT A TRANSMISSION RANGE OF 440 TO 580 MU AT SUBSTANTIALLY UNITY MAGNIFICATION, SAID OBJECTIVE COMPRISING A PAIR OF NEGATIVE COMPOUND MENICUS LENSES, AND A PAIR OF POSITIVE SINGLET MENISCUS LENSES OPTICALLY ALIGNED SYMMETRICALLY BETWEEN SAID FIRST PAIR OF SYMMETRICALLY SPACED FROM AN INTERPOSED DIAPHRAGM, EACH SAID PAIR OF LENSES HAVING ALL OF THEIR REFRACTIVE SURFACES CONCAVE TOWARD SAID DIAPHRAGM, AND THE HALF FIELD ANGLE BEING SUBSTANTIALLY 20*, SAID COMPOUND LENSES BEING COMPOSED OF AN OUTWARD POSITIVE MENISCUS ELEMENT AND INNER NEGATIVE MENISCUS ELEMENT WHOSE ADJOINING REFRACTIVE SURFACE LIE IN COMPLETE CONTACT WITH EACH OTHER TO FORM AN INTERFACE, THE FOCAL LENGTHS OF THE SUCCESSIVE LENS ELEMENTS REPRESENTED BY FI TO FVI BEING GIVEN SUBSTANTIALLY IN THE FOLLOWING TABLE OF MATHEMATICAL EXPRESSIONS WHEREIN F DESIGNATED THE EQUIVALENT FOCAL LENGTH OF SAID OBJECTIVE,
Claim 2
Dependent Claim
141 words
A SYMMETRICAL PROJECTION OBJECTIVE FOR COPYING AND PROCESS WORK AT A TRANSMISSION RANGE OF 440 TO 580 MU AT SUBSTANTIALLY UNITY MAGNIFICATION, SAID OBJECTIVE COMPRISING A PAIR OF NEGATIVE COMPOUND MENICUS LENSES, AND A PAIR OF POSITIVE SINGLET MENISCUS LENSES OPTICALLY ALIGNED SYMMETRICALLY BETWEEN SAID FIRST PAIR OF SYMMETRICALLY SPACED FROM AN INTERPOSED DIAPHRAGM, EACH SAID PAIR OF LENSES HAVING ALL OF THEIR REFRACTIVE SURFACES CONCAVE TOWARD SAID DIAPHRAGM, AND THE HALF FIELD ANGLE BEING SUBSTANTIALLY 20*, SAID COMPOUND LENSES BEING COMPOSED OF AN OUTWARD POSITIVE MENISCUS ELEMENT AND INNER NEGATIVE MENISCUS ELEMENT WHOSE ADJOINING REFRACTIVE SURFACE LIE IN COMPLETE CONTACT WITH EACH OTHER TO FORM AN INTERFACE, THE FOCAL LENGTHS OF THE SUCCESSIVE LENS ELEMENTS REPRESENTED BY FI TO FVI BEING GIVEN SUBSTANTIALLY IN THE FOLLOWING TABLE OF MATHEMATICAL EXPRESSIONS WHEREIN F DESIGNATED THE EQUIVALENT FOCAL LENGTH OF SAID OBJECTIVE,
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |