US2493838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoprinting processes
Assignee: Individual
•
Filing: 1945-07-19
•
Granted: 1950-01-10
•
Expires: 1965-07-19
Abstract
No abstract record available.
Inventors
- 👤 Bennett F Terry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:37
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/268
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
59 words
THE HEREIN DESCRIBED METHOD OF TREATING THE GELATINE IN PHOTOGRAPHIC EMULSIONS WHICH CONSISTS OF IMMERSING A MEDIUM CARRYING A GELATINE EMULSION FOR SEVERAL MINUTES IN A SOLUTION CONTAINING FORMALDEHYDE AND AMINOACETIC ACID, WHEREBY SAID FORMALDEHYDE ACTS AS AN AGENT FOR ARTIFICIALLY AGING OR HERDENING SAID GELATINE, AND SAID ACID ACTS TO NEUTRALIZE THE RESIDUAL FORMALDEHYDE REMAINING IN SAID EMULSION.
Claim 2
Dependent Claim
59 words
THE HEREIN DESCRIBED METHOD OF TREATING THE GELATINE IN PHOTOGRAPHIC EMULSIONS WHICH CONSISTS OF IMMERSING A MEDIUM CARRYING A GELATINE EMULSION FOR SEVERAL MINUTES IN A SOLUTION CONTAINING FORMALDEHYDE AND AMINOACETIC ACID, WHEREBY SAID FORMALDEHYDE ACTS AS AN AGENT FOR ARTIFICIALLY AGING OR HERDENING SAID GELATINE, AND SAID ACID ACTS TO NEUTRALIZE THE RESIDUAL FORMALDEHYDE REMAINING IN SAID EMULSION.
Claim 3
Independent Claim
94 words
THE METHOD OF TREATING A PLATE OR FILM CARRYING A PHOTOGRAPHIC EMULSION WHICH CONSISTS OF IMMERSING THE EXPOSED PLATE, AFTER IT HAS BEEN DEVELOPED AND FIXED, FOR SEVERAL MINUTES IN A SOLUTION CONTAINING FORMALIN AND AN AMINO COMPOUND, WHEREBY SAID FORMALIN ARTIFICIALLY AGES SAID GELATINE, AND SAID AMINO COMPOUND COMBINES WITH EXCESS FORMALIN IN THE GELATINE TO FORM INERT COMPOUNDS WHICH DO NOT INTERFERE WITH INK PICK-UP, AND THE FINAL STEP OF TANNING SAID PLATE IN A SOLUTION CONTAINING A BICHROMATE FOR MAKING THE PORTIONS OF SAID PLATE CONTAINING METALLIC SILVER GREASY INK SELECTIVE.
Claim 4
Independent Claim
94 words
THE METHOD OF TREATING A PLATE OR FILM CARRYING A PHOTOGRAPHIC EMULSION WHICH CONSISTS OF IMMERSING THE EXPOSED PLATE, AFTER IT HAS BEEN DEVELOPED AND FIXED, FOR SEVERAL MINUTES IN A SOLUTION CONTAINING FORMALIN AND AN AMINO COMPOUND, WHEREBY SAID FORMALIN ARTIFICIALLY AGES SAID GELATINE, AND SAID AMINO COMPOUND COMBINES WITH EXCESS FORMALIN IN THE GELATINE TO FORM INERT COMPOUNDS WHICH DO NOT INTERFERE WITH INK PICK-UP, AND THE FINAL STEP OF TANNING SAID PLATE IN A SOLUTION CONTAINING A BICHROMATE FOR MAKING THE PORTIONS OF SAID PLATE CONTAINING METALLIC SILVER GREASY INK SELECTIVE.
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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) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |