US3816128A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic film unit
Assignee: Polaroid Corp
•
Filing: 1971-04-02
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Granted: 1974-06-11
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Expires: 1991-04-02
Abstract
Abstract A self-developing photographic film unit adapted to be processed by a viscous liquid processing composition distributed within the film unit from the leading end toward the trailing end by movement of the film unit between a pair of pressure-applying members. The film unit includes a photosensitive sheet having a trailing end section, a transparent second sheet having a trailing end section, located in face-to-face relation with the photosensitive sheet and a retaining sheet engaged around and secured to the trailing end sections of the photosensitive and second sheets. The film unit is designed to remain intact following image formation in the region between sheets and a spacing element, which may be generally comb-shaped, is secured between the retaining sheet and the surfaces of the trailing end sections of the sheets to provide liquid trapping spaces located externally of the image-containing region between the sheets for collecting and retaining excess processing liquid overrun.
Inventors
- 👤 R Chen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:16
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/42; G03B; G03B17/00; G03B17/28; G03B17/32; G03B17/34
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
42 words
A photographic film unit as defined in claim 1 wherein said retaining sheet is perforated in the region of said space provided by said spacing element between said retaining sheet and said other sheet to permit air to escape from said space.
Claim 2
Dependent Claim
40 words
A photographic film unit as defined in claim 1 wherein said retaining sheet is adhered to said spacing element and to said other sheet adjacent the edge of said spacing element furthest from the trailing end of said film unit.
Claim 3
Dependent Claim
40 words
A photographic film unit as defined in claim 1 wherein said spacing element extends from side to side of said film unit and includes spaced sections extending at least to the trailing edge of said portions of said other sheet.
Claim 4
Dependent Claim
31 words
A photographic film unit as defined in claim 4 wherein said spaced sections extend beyond the trailing end of said other sheet substantially to the trailing edge of said one sheet.
Claim 5
Dependent Claim
72 words
A photographic film unit as defined in claim 4 wherein said spacing element includes end sections extending adjacent the lAteral edges of said film unit beyond the trailing edge of said other sheet to the trailing edge of said one sheet, said end sections including portions thicker than the remaining portions of said end sections by substantially the thickness of said other sheet and located intermediate the trailing edges of said sheet.
Claim 6
Dependent Claim
52 words
A photographic film unit as defined in claim 1 wherein said spacing element is generally comb-shaped including a longitudinal section extending from side to side of said film unit and spaced teeth extending from said longitudinal section toward and to at least the trailing edge of said portion of said other sheet.
Claim 7
Dependent Claim
30 words
A photographic film unit as defined in claim 7 wherein said teeth extend beyond said trailing edge of said other sheet substantially to the trailing edge of said one sheet.
Claim 8
Dependent Claim
45 words
A photographic film unit as defined in claim 7 wherein said other sheet includes lateral trailing edge sections extending to the trailing edge of said one sheet and a medial section having a trailing edge spaced inwardly from said trailing edge of said one sheet.
Claim 9
Dependent Claim
31 words
A photographic film unit as defined in claim 9 wherein said spacing element includes end sections secured between said lateral trailing edge sections of said other sheet and said retaining sheet.
Claim 10
Dependent Claim
64 words
A photographic film unit as defined in claim 7 wherein said longitudinal section and said teeth of said comb-shaped spacing element cooperate with said retaining sheet and said other sheet to define spaces between said retaining sheet, said other sheet, and said teeth for collecting processing liquid, and said longitudinal section includes recesses intermediate said teeth for permitting air to escape from said spaces.
Claim 11
Dependent Claim
57 words
A photographic film unit as defined in claim 11 wherein said retaining sheet is adhered to said outer surface of said other sheet adjacent said longitudinal section of said spacing element throughout substantially the entire length of said spacing element except for spaced regions permitting air to escape from between said retaining sheet and said other sheet.
Claim 12
Dependent Claim
33 words
A photographic film unit as defined in claim 11 wherein said retaining sheet is perforated in the region of said recesses in said longitudinal section to permit air to escape from said spaces.
Claim 13
Dependent Claim
39 words
A photographic film unit as defined in claim 1 wherein said spacing element comprises a narrow strip of substantially rectangular sheet material formed with a plurality of regularly arranged circular openings for collecting and retaining said excess processing fluid.
Claim 14
Dependent Claim
52 words
A photographic film unit as defined in claim 14 wherein said circular openings are arranged in a row centrally positioned between the longitudinal margins of said spacing element and said spacing element further includes two rows of partial openings in the form of indentations in the longitudinal margins of said spacing elements.
References Cited (Backward Citations)
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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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |