US2733144A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing photographic
Assignee: —
•
Filing: —
•
Granted: 1956-01-31
•
Expires: 1973-01-31
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:29
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
113 words
A METHOD OF PRODUCING PHOTOGRAPHIC CONTRASTS COMPRISING THE STEPS, EXPOSING PORTIONS OF A LIGHT-SENSITIVE SYSTEM COMPRISING A LYOPHILE SUPPORT CONTAINING A LIGHT-SENSITIVE COMPOUND SELECTED FROM THE GROUP CONSISTING OF O-NITRO-MANDELONITRILE AND AROMATIC DIAZO COMPOUNDS TO DECOMPOSE SAID COMPOUND AT SELECTED PORTIONS OF SAID SYSTEM, SIMULTANEOUSLY CONTACTING SAID LIGHT DECOMPOSITION PRODUCT WITH A WATER-SLOUBLE MERCUROUS SALT AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF LACTIC ACID, ACETIC ACID AND CITRIC ACID AND SOLUBLE SALTS OF SAID ACIDS IN THE PRESENCE OF MOISTURE TO FORM A PHYSICALLY INTENSIFICALBE CONTRAST, AND SUBSEQUENTLY PHYSICALLY DEVELOPING SAID CONTRAST BY APPLYING THERETO A DEVELOPING SOLUTION CONTAINING A REDUCIBLE SALT OF A NOBLE METAL AND A WATER-SOLUBLE REDUCING AGENT.
Claim 2
Independent Claim
113 words
A METHOD OF PRODUCING PHOTOGRAPHIC CONTRASTS COMPRISING THE STEPS, EXPOSING PORTIONS OF A LIGHT-SENSITIVE SYSTEM COMPRISING A LYOPHILE SUPPORT CONTAINING A LIGHT-SENSITIVE COMPOUND SELECTED FROM THE GROUP CONSISTING OF O-NITRO-MANDELONITRILE AND AROMATIC DIAZO COMPOUNDS TO DECOMPOSE SAID COMPOUND AT SELECTED PORTIONS OF SAID SYSTEM, SIMULTANEOUSLY CONTACTING SAID LIGHT DECOMPOSITION PRODUCT WITH A WATER-SLOUBLE MERCUROUS SALT AND A COMPOUND SELECTED FROM THE GROUP CONSISTING OF LACTIC ACID, ACETIC ACID AND CITRIC ACID AND SOLUBLE SALTS OF SAID ACIDS IN THE PRESENCE OF MOISTURE TO FORM A PHYSICALLY INTENSIFICALBE CONTRAST, AND SUBSEQUENTLY PHYSICALLY DEVELOPING SAID CONTRAST BY APPLYING THERETO A DEVELOPING SOLUTION CONTAINING A REDUCIBLE SALT OF A NOBLE METAL AND A WATER-SOLUBLE REDUCING AGENT.
References Cited (Backward Citations)
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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) | 1959-01-30 | 1959-08-01 | 1960-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-30 | 1963-08-01 | 1964-01-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-30 | 1967-08-01 | 1968-01-31 | $7700.00 | Window Closed / Lapsed |