US3578847A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Three element objective lens
Assignee: Polaroid Corp
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Filing: 1969-10-03
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Granted: 1971-05-18
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Expires: 1989-10-03
Abstract
Abstract A telephoto triplet objective lens is disclosed wherein the first element facing the longer conjugate is a positive meniscus lens of relatively high power and thickness. The second element is a negative, biconcave, relatively thick, lens. The third element is a relatively thin biconvex positive lens. Lens elements two and three are made from the same material. This lens is designed to be molded from polymer materials.
Inventors
- 👤 David S Grey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:08
CPC Classifications
G; G02; G02B; G02B7/00; G02B7/02; G02B7/04; G02B13/00; G02B13/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
42 words
A front element focusing, axially aligned, three element, air spaced, telephoto objective lens system with a useful image area whose diameter is at least equal to its focal length, having the following characteristics related to a focal length, F, equal to unity:
Claim 2
Dependent Claim
42 words
A front element focusing, axially aligned, three element, air spaced, telephoto objective lens system with a useful image area whose diameter is at least equal to its focal length, having the following characteristics related to a focal length, F, equal to unity:
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) | 1974-05-17 | 1974-11-16 | 1975-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-17 | 1978-11-16 | 1979-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-17 | 1982-11-16 | 1983-05-18 | $7700.00 | Window Closed / Lapsed |