US3758376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opaque papers and photographic papers prepared therefrom
Assignee: Schoeller Technical Papers Inc
•
Filing: 1970-06-29
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Granted: 1973-09-11
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Expires: 1990-06-29
Abstract
Abstract GRAY OPAQUE PAPERS SUITABLE FOR USE IN THE PHOTOGRAPHIC ART ARE PREPARED BY ADDING TO A SUSPENSION OF FIBERS, PRIOR TO FORMING, A LIGHT ABSORBING COLORANT, TITANIUM PIGMENT PARTICLES AND A SMALL AMOUNT OF COLLOIDAL MATERIAL CARRYING A SURFACE ELECTRICAL CHARGE. IN SUCH PAPERS, SMALLER THAN USUAL AMOUNTS OF THE LIGHT ABSORBING MATERIAL ARE NECESSARY TO PRODUCE OPACITY TO ACTINIC LIGHT. SUCH PAPERS CAN BE BASECOATED WITH A WHITE PIGMENT COATING, COATED WITH A DIFFUSION TRANSFER POSITIVE EMULSION AND BACKCOATED WITH A CURL, WATER AND SOLVENT RESISTANT COATING TO PRODUCE A POSITIVE PRINT PAPER FOR USE IN POD DEVELOPMENT IN DIFFUSION TYPE PHOTOGRAPHIC PROCESSES.
Inventors
- 👤 C Beckner
- 👤 K Kasper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:20
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/775
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |