US3961844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens
Assignee: Optigon Research and Development Corp
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Filing: 1974-04-12
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Granted: 1976-06-08
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Expires: 1994-04-12
Abstract
Abstract A lens for a small film format still camera which comprises four lens elements disposed behind the aperture defining means, and includes a double convex convergent lens element, a second double concave divergent lens element, a third double convex convergent element, and a fourth concave-plano lens element.
Inventors
- 👤 Ellis I. Betensky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:08
CPC Classifications
G; G02; G02B; G02B9/00; G02B9/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
A lens having characteristics substantially as follows as scaled to a 23.5mm equivalent focal length:Lens Radius Lens Thickness N d V d or air Space Distance______________________________________ r1 10.05mmL1 2.08mm 1.694 30.9 r2 -66.137 .23 r3 -20.40L2 2.00 1.792 25.5 r4 10.616 2.095 r5 27.597L3 2.15 1.643 59.9 r6 -12.989 18.02 r7 -13.755L4 1.50 1.491 58.4 r8 Plano 1.0______________________________________ Film Plane Where N d is the index of refraction, V d is the Abbe number and L1 - L4 are lens elements from the object end.
Claim 2
Dependent Claim
85 words
A lens having characteristics substantially as follows as scaled to a 23.5mm equivalent focal length:Lens Radius Lens Thickness N d V d or air Space Distance______________________________________ r1 10.05mmL1 2.08mm 1.694 30.9 r2 -66.137 .23 r3 -20.40L2 2.00 1.792 25.5 r4 10.616 2.095 r5 27.597L3 2.15 1.643 59.9 r6 -12.989 18.02 r7 -13.755L4 1.50 1.491 58.4 r8 Plano 1.0______________________________________ Film Plane Where N d is the index of refraction, V d is the Abbe number and L1 - L4 are lens elements from the object end.
References Cited (Backward Citations)
US3429997A
Cited
US3516735A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |