Patent US3589258A successfully refreshed from Google Patents.
US3589258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light control means in a camera
Assignee: Bell and Howell Co
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Filing: 1968-11-29
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Granted: 1971-06-29
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Expires: 1988-11-29
Abstract
Abstract Light reducing areas, on a filter effective for outdoor lighting conditions, block light passage to a film plane from one or more extra-aperture slots generated by an iris when set at an intermediate aperture condition, thereby preventing the image degrading effects caused by light passing through the said slotlike openings.
Inventors
- 👤 Henry J Koeber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:53
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/02; G03B17/12; G03B19/00; G03B19/18
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
111 words
In a camera having an adjustable iris defining an aperture opening adapted to transmit light toward the film plane of the camera, and a filter arranged for selective movement into and out of the light path, the iris having blades arranged for movement between a minimum aperture condition and having an intermediate condition in which said aperture opening is generated to effect light passing through said iris and through additional areas radially extending from said aperture opening, the improvement comprising: discrete light reducing areas located on said filter adjacent the periphery thereof for blocking light normally admitted through said radially extending areas when said filter is out of the light path.
Claim 2
Dependent Claim
111 words
In a camera having an adjustable iris defining an aperture opening adapted to transmit light toward the film plane of the camera, and a filter arranged for selective movement into and out of the light path, the iris having blades arranged for movement between a minimum aperture condition and having an intermediate condition in which said aperture opening is generated to effect light passing through said iris and through additional areas radially extending from said aperture opening, the improvement comprising: discrete light reducing areas located on said filter adjacent the periphery thereof for blocking light normally admitted through said radially extending areas when said filter is out of the light path.
Claim 3
Dependent Claim
15 words
A combination according to claim 1 in which said light reducing areas are substantially opaque.
References Cited (Backward Citations)
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US3006265A
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US3183814A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |