US2827375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamines as short stop agents for azinte color developers
Assignee: GAF Chemicals Corp
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Filing: 1954-03-26
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Granted: 1958-03-18
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Expires: 1974-03-26
Abstract
No abstract record available.
Inventors
- 👤 Andreyev Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 03:20
CPC Classifications
G; G03; G03C; G03C7/00; G03C7/30; G03C7/3046
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
A PHOTOGRAPHIC STOP BATH EFFECTIVE TO REMOVE RESIDUAL AZINE DEVELOPER FROM LIGHT SENSITIVE PHOTOGRAPHIC EMULSIONS COMPRISING AN AQUEOUS SOLUTION OF A POLYAMINE SELECTED FROM THE CLASS CONSISTING OF HEXAMETHYLENETETRAMINE AND GLYCOSINE, SAID SOLUTION INCLUDING GLYOXAL BISULFITE AS A CLARIFYING AGENT, AND CONTAINING SUFFICIENT ACID TO PRODUCE A PH BELOW 7.
Claim 2
Dependent Claim
50 words
A PHOTOGRAPHIC STOP BATH EFFECTIVE TO REMOVE RESIDUAL AZINE DEVELOPER FROM LIGHT SENSITIVE PHOTOGRAPHIC EMULSIONS COMPRISING AN AQUEOUS SOLUTION OF A POLYAMINE SELECTED FROM THE CLASS CONSISTING OF HEXAMETHYLENETETRAMINE AND GLYCOSINE, SAID SOLUTION INCLUDING GLYOXAL BISULFITE AS A CLARIFYING AGENT, AND CONTAINING SUFFICIENT ACID TO PRODUCE A PH BELOW 7.
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) | 1961-03-17 | 1961-09-16 | 1962-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-17 | 1965-09-16 | 1966-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-17 | 1969-09-16 | 1970-03-18 | $7700.00 | Window Closed / Lapsed |