US2696439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic stabilization process
Assignee: Individual
•
Filing: 1952-01-04
•
Granted: 1954-12-07
•
Expires: 1972-01-04
Abstract
No abstract record available.
Inventors
- 👤 Levinos Steven
- 👤 Willard C Burner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:54
CPC Classifications
G; G03; G03C; G03C5/00; G03C5/26; G03C5/38; G03C5/39
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
96 words
A METHOD OF PROCESSING PHOTOGRAPHIC MATERIAL HAVING AN EXPOSED SILVER HALIDE, LIGHT SENSITIVE LAYER COMPRISING DEVELOPING SAID PHOTOGRAPHIC MATERIAL IN A DEVELOPER WHEREIN THE DEVELOPING AGENT IS 2,4-DIAMINOPHENOL HYDROCHLORIDE, SAID DEVELOPER HAVING A SUBSTANTIALLY NEUTRAL PH VALUE, REMOVING THE MATERIAL FROM THE DEVELOPER, TREATING THE DEVELOPED MATERIAL WITH A SOLUTION OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN ALUM AND AN ACID SALT OF A POLYBASIC ACID, SAID SOLUTION CHARACTERIZED IN THAT IT WILL MAINTAIN SUBSTANTIAL CHEMICAL NEUTRALITY WITHIN THE MATERIAL, AND TREATING THE PHOTOGRAPHIC MATERIAL IN A 1% TO 3% SOLUTION OF THIOUREA.
Claim 2
Independent Claim
96 words
A METHOD OF PROCESSING PHOTOGRAPHIC MATERIAL HAVING AN EXPOSED SILVER HALIDE, LIGHT SENSITIVE LAYER COMPRISING DEVELOPING SAID PHOTOGRAPHIC MATERIAL IN A DEVELOPER WHEREIN THE DEVELOPING AGENT IS 2,4-DIAMINOPHENOL HYDROCHLORIDE, SAID DEVELOPER HAVING A SUBSTANTIALLY NEUTRAL PH VALUE, REMOVING THE MATERIAL FROM THE DEVELOPER, TREATING THE DEVELOPED MATERIAL WITH A SOLUTION OF A MATERIAL SELECTED FROM THE GROUP CONSISTING OF AN ALUM AND AN ACID SALT OF A POLYBASIC ACID, SAID SOLUTION CHARACTERIZED IN THAT IT WILL MAINTAIN SUBSTANTIAL CHEMICAL NEUTRALITY WITHIN THE MATERIAL, AND TREATING THE PHOTOGRAPHIC MATERIAL IN A 1% TO 3% SOLUTION OF THIOUREA.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-12-06 | 1958-06-07 | 1958-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-06 | 1962-06-07 | 1962-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-06 | 1966-06-07 | 1966-12-07 | $7700.00 | Window Closed / Lapsed |