Patent US3948662A successfully refreshed from Google Patents.
US3948662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of processing film unit with processing solution wave front modifying means
Assignee: Polaroid Corp
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Filing: 1973-09-20
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Granted: 1976-04-06
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Expires: 1993-09-20
Abstract
Abstract A photographic film assemblage including a container, a plurality of self-developing film units within the container which are adapted to be sequentially exposed and treated with a liquid processing composition, and members associated with the container so as to form an integral part of the assemblage for controlling the distribution of the liquid processing composition during treatment of a film unit. A photographic apparatus with which the film assemblage is adapted to be used includes structure for locating the distribution control members in operative association with a film unit located in position for exposure and subsequent treatment with the liquid processing composition.
Inventors
- 👤 William W. Alston, Jr.
- 👤 John J. Driscoll
- 👤 Richard R. Wareham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:16
CPC Classifications
G; G03; G03D; G03D9/00; G03D9/02; G03B; G03B17/00; G03B17/28; G03B17/32; G03B17/34
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
280 words
A method of distributing a processing fluid between predetermined layers of a film unit provided in a film container which is adapted to be inserted into and supported in a photographic apparatus for locating said film unit in said film container in position for exposure, said film container being of the type which further includes an exposure aperture through which said film unit is adapted to be exposed, a withdrawal slot through which said film unit is adapted to be withdrawn from said film container, said fluid distribution control means in said film container adjacent said withdrawal slot, said method comprising the steps of: progressively advancing said film unit from said exposure position in said film container past said fluid distribution control means adjacent said withdrawal slot, through said withdrawal slot, and between pressure applying means mounted on said apparatus; applying a first compressive pressure to said film unit with said pressure applying means to dispense a fluid processing composition, from a container associated with said film unit, between predetermined layers of said film unit and for advancing said fluid along a wave front between said layers as said film unit is advanced relative to said pressure applying means; and simultaneously applying a second compressive pressure to said film unit with said fluid distribution control means adjacent said withdrawal slot to modify the shape of said liquid wave front to effect a more substantially uniform distribution of said fluid between said layers; said first compressive pressure being applied across the entire width of an image forming area of said film unit and said second compressive pressure being applied to only a portion of the width of said image forming area.
Claim 2
Independent Claim
280 words
A method of distributing a processing fluid between predetermined layers of a film unit provided in a film container which is adapted to be inserted into and supported in a photographic apparatus for locating said film unit in said film container in position for exposure, said film container being of the type which further includes an exposure aperture through which said film unit is adapted to be exposed, a withdrawal slot through which said film unit is adapted to be withdrawn from said film container, said fluid distribution control means in said film container adjacent said withdrawal slot, said method comprising the steps of: progressively advancing said film unit from said exposure position in said film container past said fluid distribution control means adjacent said withdrawal slot, through said withdrawal slot, and between pressure applying means mounted on said apparatus; applying a first compressive pressure to said film unit with said pressure applying means to dispense a fluid processing composition, from a container associated with said film unit, between predetermined layers of said film unit and for advancing said fluid along a wave front between said layers as said film unit is advanced relative to said pressure applying means; and simultaneously applying a second compressive pressure to said film unit with said fluid distribution control means adjacent said withdrawal slot to modify the shape of said liquid wave front to effect a more substantially uniform distribution of said fluid between said layers; said first compressive pressure being applied across the entire width of an image forming area of said film unit and said second compressive pressure being applied to only a portion of the width of said image forming area.
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) | 1979-04-06 | 1979-10-06 | 1980-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-06 | 1983-10-06 | 1984-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-06 | 1987-10-06 | 1988-04-06 | $7700.00 | Window Closed / Lapsed |