Patent US4295713A successfully refreshed from Google Patents.
US4295713A
Expired / Lapsed
US
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Film and photographic apparatus
Assignee: Eastman Kodak Co
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Filing: 1980-04-09
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Granted: 1981-10-20
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Expires: 2000-04-09
Abstract
Abstract A film magazine contains a roll of film having an image portion and a leader. The filmstrip is perforated at predetermined intervals with larger perforations in the image portion than in the leader. A camera mechanism is disclosed which uses the perforations to advance the filmstrip, detects the size of the perforations, and meters only when a large, image portion perforation is advanced to a predetermined position in the camera.
Inventors
- 👤 Evan A. Edwards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:08
CPC Classifications
G; G03; G03B; G03B1/00; G03B1/18; G03B1/20; G03B1/22; G03B17/00; G03B17/26; G03B19/00; G03B19/02; G03B19/04; G03B2217/00; G03B2217/26; G03B2217/261
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
62 words
In a photographic filmstrip having an image portion and a leader; the improvement comprising: at least one row of perforations of a pre-determined size along the image portion; and at least one row of perforations in the leader, said perforations in the leader being aligned with and smaller in a direction longitudinally of said filmstrip than the perforations along the image portion.
Claim 2
Dependent Claim
62 words
In a photographic filmstrip having an image portion and a leader; the improvement comprising: at least one row of perforations of a pre-determined size along the image portion; and at least one row of perforations in the leader, said perforations in the leader being aligned with and smaller in a direction longitudinally of said filmstrip than the perforations along the image portion.
Claim 3
Dependent Claim
121 words
In a filmstrip adapted for use with photographic apparatus of the type having (1) a transport mechanism for advancing the filmstrip, (2) means for sensing perforations in the filmstrip and for distinguishing between different sized perforations, and (3) means for metering the transport mechanism upon detection of a perforation of at least a predetermined size; the improvement in said filmstrip comprising: an image portion having perforations of at least said predetermined size at metering intervals along said image portion; and a leader having perforations of less than said predetermined size spaced therealong, whereby the transport mechanism will not be metered upon the perforations in said leader being sensed and will be metered upon the perforations in said image portion being sensed.
Claim 4
Dependent Claim
121 words
In a filmstrip adapted for use with photographic apparatus of the type having (1) a transport mechanism for advancing the filmstrip, (2) means for sensing perforations in the filmstrip and for distinguishing between different sized perforations, and (3) means for metering the transport mechanism upon detection of a perforation of at least a predetermined size; the improvement in said filmstrip comprising: an image portion having perforations of at least said predetermined size at metering intervals along said image portion; and a leader having perforations of less than said predetermined size spaced therealong, whereby the transport mechanism will not be metered upon the perforations in said leader being sensed and will be metered upon the perforations in said image portion being sensed.
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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |