US3074318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zoom lens system
Assignee: Canon Inc
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Filing: 1960-09-02
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Granted: 1963-01-22
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Expires: 1980-09-02
Abstract
No abstract record available.
Inventors
- 👤 Yamaji Keizo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:30
CPC Classifications
G; G02; G02B; G02B15/00; G02B15/14; G02B15/144; G02B15/1441
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
169 words
A ZOOM LENS SYSTEM COMPRISING A FIRST POSITIVE COMPONENT CONSISTING OF A CEMENTED DOUBLET HIGHLY CONVEX TO THE OBJECT SIDE OF THE SYSTEM AND A SINGLE POSITIVE MENISCUS HIGHLY CONVEX TO THE OBJECT SIDE AND POSITIONED CLOSE TO THE DOUBLET, A SECOND NEGATIVE COMPONENT CONSISTING OF TWO SINGLE NEGATIVE ELEMENTS POSITIONED PARALLEL TO EACH OTHER AND BOTH HIGHLY CONCAVE TO THE IMAGE SIDE OF THE SYSTEM AND A CEMENTED DOUBLET HIGHLY CONCAVE TO THE OBJECT SIDE WITH ITS CEMENTED SURFACE HIGHLY CONVEX TO THE OBJECT SIDE, A THIRD COMPONENT CONSISTING OF A SINGLE BICONCAVE ELEMENT HIGHLY CONCAVE TO THE OBJECT SIDE, AND A FOURTH FIXED COMPONENT FOR IMAGE FORMATION POSITIONED TO THE REAR OF THE THIRD COMPONENT; THE SECOND COMPONENT BEING SELECTIVELY MOVABLE IN ONE DIRECTION TO THE OBJECT SIDE AND TO THE IMAGE SIDE WHILE THE THIRD COMPONENT IS MOVED RECIPROCATABLY WHEN THE MAGNIFICATION OF THE SYSTEM IS VARIED FROM ONE EXTREME VALUE TO THE OTHER EXTREME VALUE WITHIN THE ZOOMING RANGE; THE SYSTEM SATISFYING THE FOLLOWING CONDITIONS:
Claim 2
Dependent Claim
169 words
A ZOOM LENS SYSTEM COMPRISING A FIRST POSITIVE COMPONENT CONSISTING OF A CEMENTED DOUBLET HIGHLY CONVEX TO THE OBJECT SIDE OF THE SYSTEM AND A SINGLE POSITIVE MENISCUS HIGHLY CONVEX TO THE OBJECT SIDE AND POSITIONED CLOSE TO THE DOUBLET, A SECOND NEGATIVE COMPONENT CONSISTING OF TWO SINGLE NEGATIVE ELEMENTS POSITIONED PARALLEL TO EACH OTHER AND BOTH HIGHLY CONCAVE TO THE IMAGE SIDE OF THE SYSTEM AND A CEMENTED DOUBLET HIGHLY CONCAVE TO THE OBJECT SIDE WITH ITS CEMENTED SURFACE HIGHLY CONVEX TO THE OBJECT SIDE, A THIRD COMPONENT CONSISTING OF A SINGLE BICONCAVE ELEMENT HIGHLY CONCAVE TO THE OBJECT SIDE, AND A FOURTH FIXED COMPONENT FOR IMAGE FORMATION POSITIONED TO THE REAR OF THE THIRD COMPONENT; THE SECOND COMPONENT BEING SELECTIVELY MOVABLE IN ONE DIRECTION TO THE OBJECT SIDE AND TO THE IMAGE SIDE WHILE THE THIRD COMPONENT IS MOVED RECIPROCATABLY WHEN THE MAGNIFICATION OF THE SYSTEM IS VARIED FROM ONE EXTREME VALUE TO THE OTHER EXTREME VALUE WITHIN THE ZOOMING RANGE; THE SYSTEM SATISFYING THE FOLLOWING CONDITIONS:
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) | 1966-01-21 | 1966-07-23 | 1967-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-21 | 1970-07-23 | 1971-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-21 | 1974-07-23 | 1975-01-22 | $7700.00 | Window Closed / Lapsed |