Patent US2219701A successfully refreshed from Google Patents.
Patent US3348899A successfully refreshed from Google Patents.
US3348899A
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Zoom objective
Assignee: Eastman Kodak Co
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Filing: 1964-05-13
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Granted: 1967-10-24
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Expires: 1984-05-13
Abstract
No abstract record available.
Inventors
- 👤 William H Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 05:56
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/145; G02B15/1451
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A ZOOM OBJECTIVE WITH A FRONT ZOOM MEMBER AND A REAR CONVERGING MEMBER, THE FRONT ZOOM MEMBER COMPRISING FOUR COMPONENTS MADE UP OF SIX ELEMENTS, FROM FRONT TO REAR, A POSITIVE BICONVEX DOUBLET, A NEGATIVE BICONCAVE DOUBLET, A SINGLE NEGATIVE ELEMENT AND SINGLE POSITIVE ELEMENT, THE NAGATIVE BICONCAVE DOUBLET BEING MOVABLE TO VARY THE MAGNIFICATION OF THE OBJECTIVE AND THE SINGLE POSITIVE ELEMENT BEING MOVABLE AND MECHANICALLY COULPLE WITH SAID BICONCAVE DOUBLET SO THAT THE BACK FOCAL LENGTH OF THE OBJECTIVE IS SUBSTANTIALLY CONSTANT FOR ALL SETTINGS OF THE TWO MOVABLE MEMBERS, SAID FRONT ZOOM MEMBER BEING CHARACTERIZED IN THAT ITS ELEMENTS CONFORM TO THE FOLLOWING TABLE:
Claim 2
Dependent Claim
107 words
A ZOOM OBJECTIVE WITH A FRONT ZOOM MEMBER AND A REAR CONVERGING MEMBER, THE FRONT ZOOM MEMBER COMPRISING FOUR COMPONENTS MADE UP OF SIX ELEMENTS, FROM FRONT TO REAR, A POSITIVE BICONVEX DOUBLET, A NEGATIVE BICONCAVE DOUBLET, A SINGLE NEGATIVE ELEMENT AND SINGLE POSITIVE ELEMENT, THE NAGATIVE BICONCAVE DOUBLET BEING MOVABLE TO VARY THE MAGNIFICATION OF THE OBJECTIVE AND THE SINGLE POSITIVE ELEMENT BEING MOVABLE AND MECHANICALLY COULPLE WITH SAID BICONCAVE DOUBLET SO THAT THE BACK FOCAL LENGTH OF THE OBJECTIVE IS SUBSTANTIALLY CONSTANT FOR ALL SETTINGS OF THE TWO MOVABLE MEMBERS, SAID FRONT ZOOM MEMBER BEING CHARACTERIZED IN THAT ITS ELEMENTS CONFORM TO THE FOLLOWING TABLE:
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-23 | 1971-04-24 | 1971-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-23 | 1975-04-24 | 1975-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-23 | 1979-04-24 | 1979-10-24 | $7700.00 | Window Closed / Lapsed |