US2706157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Processing photographic paper and film
Assignee: Grant Photo Products Inc
•
Filing: 1951-07-21
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Granted: 1955-04-12
•
Expires: 1971-07-21
Abstract
No abstract record available.
Inventors
- 👤 Leonard R Sainsbury
- 👤 Francis J Farren
- 👤 Alan S Grant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:46
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/39; G03C1/00; G03C1/005; G03C1/06; G03C1/36; Y; Y10; Y10S; Y10S430/00; Y10S430/164
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
187 words
A METHOD OF SHORTENING THE PROCESSING TIME OF PHOTOGRAPHIC MATERIAL COMPRISING THE STEPS OF (A) PROVIDING AN EMULSION-COATED PHOTOGRAPHIC MATERIAL IN WHICH THE EMULSION COATING INCORPORATES A LIGHT-SENSITIVE SILVER HALIDE AND AN ORGANIC ACCELERATOR OF DEVELOPMENT HAVING A CAPACITY FOR AFFECTING THE LIGHT- AND DEVELOPMENT-CHARACTERISTICS OF THE SILVER HALIDE, SAID ORGANIC ACCELERATOR OF DEVELOPMENT BEING A DESENSITIZING DYE-STUFF SELECTED FROM A GROUP CONSISTING OF THE ANILS, PHENOSAFRANINES, PINAKRYPTOL GREENS AND PINAKRYPTOL YELLOWS; (B) EXPOSING THE MATERIAL TO FORM A LATENT IMAGE; (C) CONVERTING THE LATENT IMAGE TO A VISIBLE IMAGE BY SUBJECTING THE EXPOSED MATERIAL FOR A FEW SECONDS AT ROOM TEMPERATURES TO THE ACTION OF AN ALKALINE-REACTING WATER SOLUTION OF A DEVELOPER SELECTED FROM A GROUP CONSISTING OF HYDROXYLAMINE, HYDRAZINE AND PHENYLHYDRAZINE, SAID ALKALINE-REACTING SOLUTION HAVING A PH APPROACHING 12; (D) CONVERTING TO INERT FORM THE UNDEVELOPED SILVER HALIDE REMAINING IN THE MATERIAL BY SUBJECTING THE DEVELOPED MAACTION OF A STABILIZER TAKING THE FORM OF AN ACID-REACTING AQUEOUS SOLUTION OF AN ALKALI METAL SALT OF AN ACID SELECTED FROM A GROUP CONSISTING OF IODIC ACID, FLUORIC ACID AND THIOCYANIC ACID; AND (E) DRYING THE STABILIZED MATERIAL.
Claim 2
Independent Claim
187 words
A METHOD OF SHORTENING THE PROCESSING TIME OF PHOTOGRAPHIC MATERIAL COMPRISING THE STEPS OF (A) PROVIDING AN EMULSION-COATED PHOTOGRAPHIC MATERIAL IN WHICH THE EMULSION COATING INCORPORATES A LIGHT-SENSITIVE SILVER HALIDE AND AN ORGANIC ACCELERATOR OF DEVELOPMENT HAVING A CAPACITY FOR AFFECTING THE LIGHT- AND DEVELOPMENT-CHARACTERISTICS OF THE SILVER HALIDE, SAID ORGANIC ACCELERATOR OF DEVELOPMENT BEING A DESENSITIZING DYE-STUFF SELECTED FROM A GROUP CONSISTING OF THE ANILS, PHENOSAFRANINES, PINAKRYPTOL GREENS AND PINAKRYPTOL YELLOWS; (B) EXPOSING THE MATERIAL TO FORM A LATENT IMAGE; (C) CONVERTING THE LATENT IMAGE TO A VISIBLE IMAGE BY SUBJECTING THE EXPOSED MATERIAL FOR A FEW SECONDS AT ROOM TEMPERATURES TO THE ACTION OF AN ALKALINE-REACTING WATER SOLUTION OF A DEVELOPER SELECTED FROM A GROUP CONSISTING OF HYDROXYLAMINE, HYDRAZINE AND PHENYLHYDRAZINE, SAID ALKALINE-REACTING SOLUTION HAVING A PH APPROACHING 12; (D) CONVERTING TO INERT FORM THE UNDEVELOPED SILVER HALIDE REMAINING IN THE MATERIAL BY SUBJECTING THE DEVELOPED MAACTION OF A STABILIZER TAKING THE FORM OF AN ACID-REACTING AQUEOUS SOLUTION OF AN ALKALI METAL SALT OF AN ACID SELECTED FROM A GROUP CONSISTING OF IODIC ACID, FLUORIC ACID AND THIOCYANIC ACID; AND (E) DRYING THE STABILIZED MATERIAL.
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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) | 1958-04-11 | 1958-10-11 | 1959-04-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-04-11 | 1962-10-11 | 1963-04-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-04-11 | 1966-10-11 | 1967-04-12 | $7700.00 | Window Closed / Lapsed |