US3451818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite rollfilm assembly for use in the diffusion transfer process
Assignee: Polaroid Corp
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Filing: 1966-04-19
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Granted: 1969-06-24
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Expires: 1986-04-19
Abstract
No abstract record available.
Inventors
- 👤 Richard R Wareham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:00
CPC Classifications
G; G03; G03B; G03B17/00; G03B17/48; G03B17/50; G03B17/52
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
AN ASSEMBLY OF PHOTOGRAPHIC MATERIALS FOR USE IN A CAMERA ADAPTED FOR PHOTOGRAPHY ACCORDING TO THE DIFFUSION TRANSFER PROCESS COMPRISING: (A) A STRIP OF NEGATIVE PHOTOGRAPHIC FILM WOUND INTO A HELICAL COIL, THE LEADING END OF SAID STRIP BEING ADJACENT THE OUTER CONVOLUTION OF SAID COIL AND THE TRAILING END OF SAID STRIP BEING ADJACENT THE INNER CONVOLUTION OF SAID COIL; AND (B) A STRIP OF IMAGE-RECEIVING MATERIAL HELICALLY WOUND UPON SAID COILED STRIP OF NEGATIVE FILM SUCH THAT THE TRAILING END OF SAID IMAGE-RECEIVING STRIP IS ADJACENT BUT UNATTACHED TO SAID LEADING END OF SAID NEGATIVE FILM STRIP, THE LEADING END OF SAID IMAGE-RECEIVING STRIP BEING ADJACENT THE OUTER CONVOLUTION THEREOF.
Claim 2
Dependent Claim
112 words
AN ASSEMBLY OF PHOTOGRAPHIC MATERIALS FOR USE IN A CAMERA ADAPTED FOR PHOTOGRAPHY ACCORDING TO THE DIFFUSION TRANSFER PROCESS COMPRISING: (A) A STRIP OF NEGATIVE PHOTOGRAPHIC FILM WOUND INTO A HELICAL COIL, THE LEADING END OF SAID STRIP BEING ADJACENT THE OUTER CONVOLUTION OF SAID COIL AND THE TRAILING END OF SAID STRIP BEING ADJACENT THE INNER CONVOLUTION OF SAID COIL; AND (B) A STRIP OF IMAGE-RECEIVING MATERIAL HELICALLY WOUND UPON SAID COILED STRIP OF NEGATIVE FILM SUCH THAT THE TRAILING END OF SAID IMAGE-RECEIVING STRIP IS ADJACENT BUT UNATTACHED TO SAID LEADING END OF SAID NEGATIVE FILM STRIP, THE LEADING END OF SAID IMAGE-RECEIVING STRIP BEING ADJACENT THE OUTER CONVOLUTION THEREOF.
References Cited (Backward Citations)
US3022170A
Cited
US3270653A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |