US3877792A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Short focal length, large aperture optical system
Assignee: Bell and Howell Co
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Filing: 1974-04-12
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Granted: 1975-04-15
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Expires: 1994-04-12
Abstract
Abstract This invention relates to a short focal length, large aperture optical system primarily designed to efficiently transmit light rays to an image plane with an extraordinarily high degree of correction over the prescribed field.
Inventors
- 👤 Arthur Cox
- 👤 Walter J Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:12
CPC Classifications
G; G02; G02B; G02B3/00; G02B3/02; G02B3/04; G02B13/00; G02B13/18; G02B9/00; G02B9/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
16 words
An optical system of relatively short focal length and large aperture having substantially the following specification:
Claim 2
Dependent Claim
16 words
An optical system of relatively short focal length and large aperture having substantially the following specification:
Claim 3
Dependent Claim
16 words
An optical system of relatively short focal length and large aperture having substantially the following specification:
Claim 4
Dependent Claim
16 words
An optical system of relatively short focal length and large aperture having substantially the following specification:
References Cited (Backward Citations)
GB489381A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-14 | 1978-10-14 | 1979-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-14 | 1982-10-14 | 1983-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-14 | 1986-10-14 | 1987-04-15 | $7700.00 | Window Closed / Lapsed |