US3399017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat field metallurgical microscope objective
Assignee: Bausch and Lomb Inc
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Filing: 1965-08-25
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Granted: 1968-08-27
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Expires: 1985-08-25
Abstract
No abstract record available.
Inventors
- 👤 Duane E Judd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:29
CPC Classifications
G; G02; G02B; G02B21/00; G02B21/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
185 words
A MICROSCOPE SEMI-OBJECTIVE HAVING A COMBINED POSITIVE POWER OF 10X WHEN USED WITH MAGNIFICATION, SAID ALIGNED NEGATIVE CORRECTOR LENS OF 5X MAGNIFICATION, SAID SEMI-OBJECTIVE COMPRISING A FRONT DOUBLET LENS DESIGNATED I CONSISTING OF A FRONT DOUBLE CONVEX ELEMENT DESIGNATED IA AND A REAR DOUBLE CONCAVE ELEMENT DESIGNATED IB IN CONTACT THEREWITH, SAID FRONT DOUBLET LENS HAVING AN EQUIVALENT FOCAL LENGTH WHICH IS DESIGNATED F1, SAID FRONT DOUBLET LENS I BEING LOCATED AT AN AXIAL DISTANCE S1 REARWARDLY FROM THE OBJECT PLANE OF SAID OBJECTIVE, A SECOND DOUBLET LENS DESIGNATED II CONSISTING OF A FRONT POSITIVE MENISCUS ELEMENT DESIGNATED IIA AND A REAR NEGATIVE MENISCUS ELEMENT DESIGNATED IIB IN CONTACT THEREWITH, SAID SECOND DOUBLET LENS BEING SPACED REARWARDLY OF LENS I AT AN AXIAL DISTANCE DESIGNATED S2 AND HAVING AN EQUIVALENT FOCAL LENGTH DESIGNATED FII, AND A THIRD DOUBLET LENS DESIGNATED III CONSISTING OF A FRONT NEGATIVE MENISCUS ELEMENT DESIGNATED IIIA AND A REAR DOUBLE CONVEX ELEMENT DESIGNATED IIIB LYING IN CONTACT THEREWITH, SAID THIRD LENS III BEING SPACED FROM LENS II AT AN AXIAL DISTANCE DESIGNATED S3 AND HAVING AN EQUIVALENT FOCAL LENGTH DESIGNATED FIII,
Claim 2
Dependent Claim
185 words
A MICROSCOPE SEMI-OBJECTIVE HAVING A COMBINED POSITIVE POWER OF 10X WHEN USED WITH MAGNIFICATION, SAID ALIGNED NEGATIVE CORRECTOR LENS OF 5X MAGNIFICATION, SAID SEMI-OBJECTIVE COMPRISING A FRONT DOUBLET LENS DESIGNATED I CONSISTING OF A FRONT DOUBLE CONVEX ELEMENT DESIGNATED IA AND A REAR DOUBLE CONCAVE ELEMENT DESIGNATED IB IN CONTACT THEREWITH, SAID FRONT DOUBLET LENS HAVING AN EQUIVALENT FOCAL LENGTH WHICH IS DESIGNATED F1, SAID FRONT DOUBLET LENS I BEING LOCATED AT AN AXIAL DISTANCE S1 REARWARDLY FROM THE OBJECT PLANE OF SAID OBJECTIVE, A SECOND DOUBLET LENS DESIGNATED II CONSISTING OF A FRONT POSITIVE MENISCUS ELEMENT DESIGNATED IIA AND A REAR NEGATIVE MENISCUS ELEMENT DESIGNATED IIB IN CONTACT THEREWITH, SAID SECOND DOUBLET LENS BEING SPACED REARWARDLY OF LENS I AT AN AXIAL DISTANCE DESIGNATED S2 AND HAVING AN EQUIVALENT FOCAL LENGTH DESIGNATED FII, AND A THIRD DOUBLET LENS DESIGNATED III CONSISTING OF A FRONT NEGATIVE MENISCUS ELEMENT DESIGNATED IIIA AND A REAR DOUBLE CONVEX ELEMENT DESIGNATED IIIB LYING IN CONTACT THEREWITH, SAID THIRD LENS III BEING SPACED FROM LENS II AT AN AXIAL DISTANCE DESIGNATED S3 AND HAVING AN EQUIVALENT FOCAL LENGTH DESIGNATED FIII,
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) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |