US3630599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanically compensated zoom lens system
Assignee: Xerox Corp
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Filing: 1970-10-21
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Granted: 1971-12-28
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Expires: 1990-10-21
Abstract
Abstract A mechanically compensated zoom lens system consisting of two movable lens groups, each lens group consisting of four airspaced lens elements.
Inventors
- 👤 Roscoe J Donnel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:47
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/24
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
A mechanically compensated zoom lens system consisting essentially of an axially movable front lens group and an axially movable rear lens group, each lens group consisting essentially of four air-spaced elements, the front lens group consisting essentially of, from the front to the rear, a first negative meniscus convex to the front, a second negative meniscus convex to the front, a third negative meniscus convex to the front and a positive meniscus convex to the front and the rear lens group consisting essentially of, from the front to the rear a first double convex element, a double concave element, a negative meniscus element concave to the front and a second double convex element.
Claim 2
Dependent Claim
113 words
A mechanically compensated zoom lens system consisting essentially of an axially movable front lens group and an axially movable rear lens group, each lens group consisting essentially of four air-spaced elements, the front lens group consisting essentially of, from the front to the rear, a first negative meniscus convex to the front, a second negative meniscus convex to the front, a third negative meniscus convex to the front and a positive meniscus convex to the front and the rear lens group consisting essentially of, from the front to the rear a first double convex element, a double concave element, a negative meniscus element concave to the front and a second double convex element.
Claim 3
Dependent Claim
13 words
A mechanically compensated zoom lens system made substantially according to the following specifications:
Claim 4
Dependent Claim
13 words
A mechanically compensated zoom lens system made substantially according to the following specifications:
Claim 5
Dependent Claim
111 words
A mechanically compensated zoom lens system consisting essentially of an axially movable front lens group and an axially movable rear lens group, each lens group consisting essentially of four air-spaced elements, the front lens group consisting essentially of, from the front to the rear, a first negative meniscus convex to the front, a second negative meniscus convex to the front, a third negative meniscus convex to the front and a positive meniscus convex to the front and the rear lens group consisting essentially of, from the front to the rear a first double convex element, a first double concave element, a second double concave element and a second double convex element.
Claim 6
Dependent Claim
111 words
A mechanically compensated zoom lens system consisting essentially of an axially movable front lens group and an axially movable rear lens group, each lens group consisting essentially of four air-spaced elements, the front lens group consisting essentially of, from the front to the rear, a first negative meniscus convex to the front, a second negative meniscus convex to the front, a third negative meniscus convex to the front and a positive meniscus convex to the front and the rear lens group consisting essentially of, from the front to the rear a first double convex element, a first double concave element, a second double concave element and a second double convex element.
Claim 7
Dependent Claim
13 words
A mechanically compensated zoom lens system made substantially according to the following specifications:
Claim 8
Dependent Claim
13 words
A mechanically compensated zoom lens system made substantially according to the following specifications:
Claim 9
Dependent Claim
13 words
A mechanically compensated zoom lens system made substantially according to the following specifications:
Claim 10
Dependent Claim
13 words
A mechanically compensated zoom lens system made substantially according to the following specifications:
References Cited (Backward Citations)
US3143590A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |