Patent US4598041A successfully refreshed from Google Patents.
US4598041A
Expired / Lapsed
US
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Self-processing photographic film unit with dissolvable trap member
Assignee: Fujifilm Holdings Corp
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Filing: 1984-12-28
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Granted: 1986-07-01
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Expires: 2004-12-28
Abstract
Abstract A self-processing photographic film unit includes a first sheet for recording a positive image, a transparent second sheet bonded to the first sheet in face-to-face relation, a container for a processing liquid coupled to the leading end of the film unit, and a trap coupled to the trailing end of the film unit. Following exposure of the film unit, the processing liquid is distributed uniformly between the sheets, and any excess of the processing liquid from an image-recording area of the first sheet is received in the trap. The trap comprises a bag-like trap cover having a plurality of air orifices and a trap member capable of swelling and solubilizing when in contact with the processing liquid, which is surrounded the trap cover. The trap member is made of a fibrous carboxymethylcellulose sheet or a fibrous carboxymethylcellulose sheet and filter paper bonded to each other by sandwiching a liquid impervious member therebetween. The trap member contains azelaic acid as a neutralization agent and a material discharging metal cations as a coagulation agent.
Inventors
- 👤 Yoshio Hara
- 👤 Yoshiaki Ishino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 22:45
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03C8/44; G03C8/46
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
94 words
A self-processing photographic film unit comprising: a first sheet member for recording a positive image thereon; a second, transparent sheet member; a bonding member for uniting said first and second sheet members in superimposed relationship; container means for storing an aqueous alkaline processing liquid therein; and trap means for trapping any excess of said aqueous alkaline processing liquid from an image recording area of said first sheet member, said trap means being gas permeable and including therein a trap member of solid phase absorbent macromolecular material that swells and dissolves upon contact with water.
Claim 2
Dependent Claim
94 words
A self-processing photographic film unit comprising: a first sheet member for recording a positive image thereon; a second, transparent sheet member; a bonding member for uniting said first and second sheet members in superimposed relationship; container means for storing an aqueous alkaline processing liquid therein; and trap means for trapping any excess of said aqueous alkaline processing liquid from an image recording area of said first sheet member, said trap means being gas permeable and including therein a trap member of solid phase absorbent macromolecular material that swells and dissolves upon contact with water.
Claim 3
Dependent Claim
17 words
A self-processing photographic film unit as defined in claim 1, wherein said trap member is fibrous carboxy-methylcellulose.
Claim 4
Dependent Claim
22 words
A self-processing photographic film unit as defined in claim 2, wherein said trap member contains a coagulation agent comprising dischargeable metal cations.
Claim 5
Dependent Claim
28 words
A self-processing photographic film unit as defined in claim 3, wherein said trap member contains a neutralizing agent for said excess processing liquid to make the latter non-reactive.
Claim 6
Dependent Claim
24 words
A self-processing photographic film unit as defined in claim 4, wherein said neutralizing agent is azelaic acid with which said trap member is impregnated.
Claim 7
Dependent Claim
34 words
A self-processing photographic film unit as defined in claim 1, wherein said trap means includes a bag-like trap cover for surrounding said trap members, said trap cover having a plurality of air orifices therethrough.
Claim 8
Dependent Claim
46 words
A self-processing photographic film unit as defined in claim 1, wherein said trap member comprises a sheetlike, first trap element of fibrous carboxymethylcellulose, a sheetlike, second trap element of filter paper and a liquid-impervious means to be sandwiched in between said first and second trap elements.
Claim 9
Dependent Claim
48 words
A self-processing photographic film unit as defined in claim 7, wherein said trap means includes a bag-like trap cover having a plurality of air orifices therethrough, said trap cover surrounding said trap elements in such a manner that said second trap element is opposite to said air orifices.
Claim 10
Dependent Claim
20 words
A self-processing photographic film unit as defined in claim 8, wherein said first trap element is impregnated with azelaic acid.
Claim 11
Dependent Claim
23 words
A self-processing photographic film unit as defined in claim 9, wherein said first trap element contains a coagulation agent comprising dischargeable metal cations.
Claim 12
Dependent Claim
19 words
A self-processing photographic film unit as defined in claim 10, wherein said coagulation agent is ethylene diamine tetraacetate aluminum.
Claim 13
Dependent Claim
24 words
A self-processing photographic film unit as defined in claim 11, in which said ethylene diamine tetraacetate aluminum is painted on said first trap element.
Claim 14
Dependent Claim
19 words
A self-processing photographic film unit as defined in claim 12, wherein said liquid-impervious member is a vinyl acetate adhesive.
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) | 1989-06-30 | 1989-12-30 | 1990-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-30 | 1993-12-30 | 1994-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-30 | 1997-12-30 | 1998-07-01 | $7700.00 | Window Closed / Lapsed |