Patent US2735773A successfully refreshed from Google Patents.
US2735773A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a photographic
Assignee: —
•
Filing: —
•
Granted: 1956-02-21
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Expires: 1973-02-21
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:25
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/52; G03C1/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A METHOD OF PRODUCING PHOTOGRAPHIC CONTRAST WHICH COMPRISES THE STEPS OF SELECTIVELY EXPOSING PORTIONS OF A LIGHT-SENSITIVE SYSTEM CONTAINING A LIGHT-SENSITIVE DIAZOSULPHONATE AND AN ANTIREGRESSION AGENT OTHER THAN SAID DIAZOSULPHONATE CONSISTING OF A WATER-SOLUBLE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF LEAD, LANTHANUM, THORIUM, URANIUM, CADMIUM, ZINC, COPPER, COBALT AND CHRMIUM, TO DECOMPOSE SAID DIAZOSULPHONATE AND FORM A STABLE LIGHT-DECOMPOSITION PRODUCT AND SUBJECTING SAID LIGHT-DECOMPOSITION PRODUCT TO THE ACTION OF A SOLUBLE MERCUROUS SALT IN THE PRESENCE OF MOISTURE TO FORM A PHYSICALLY INTENSIFIABLE CONTRAST.
Claim 2
Independent Claim
88 words
A METHOD OF PRODUCING PHOTOGRAPHIC CONTRAST WHICH COMPRISES THE STEPS OF SELECTIVELY EXPOSING PORTIONS OF A LIGHT-SENSITIVE SYSTEM CONTAINING A LIGHT-SENSITIVE DIAZOSULPHONATE AND AN ANTIREGRESSION AGENT OTHER THAN SAID DIAZOSULPHONATE CONSISTING OF A WATER-SOLUBLE SALT OF A METAL SELECTED FROM THE GROUP CONSISTING OF LEAD, LANTHANUM, THORIUM, URANIUM, CADMIUM, ZINC, COPPER, COBALT AND CHRMIUM, TO DECOMPOSE SAID DIAZOSULPHONATE AND FORM A STABLE LIGHT-DECOMPOSITION PRODUCT AND SUBJECTING SAID LIGHT-DECOMPOSITION PRODUCT TO THE ACTION OF A SOLUBLE MERCUROUS SALT IN THE PRESENCE OF MOISTURE TO FORM A PHYSICALLY INTENSIFIABLE CONTRAST.
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) | 1959-02-20 | 1959-08-22 | 1960-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-02-20 | 1963-08-22 | 1964-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-02-20 | 1967-08-22 | 1968-02-21 | $7700.00 | Window Closed / Lapsed |