Patent US2592870A successfully refreshed from Google Patents.
US2592870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of compositions containing finely divided metallic silver
Assignee: Ward Blenkinsop and Co Ltd
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Filing: 1947-09-30
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Granted: 1952-04-15
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Expires: 1967-09-30
Abstract
No abstract record available.
Inventors
- 👤 Dickenson Haydn Geoffrey
- 👤 Chapman Kenneth Thomas
- 👤 Hopf Peter Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:16
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/06; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; H; H01; H01B; H01B1/00; C03C2217/00; C03C2217/20; C03C2217/25; C03C2217/251; C03C2218/00; C03C2218/10; C03C2218/17
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
82 words
A PROCESS FOR THE PRODUCTION OF A STABLE COMPOSITION CONTAINING FINELY-DIVIDED METALLIC SILVER HAVING A MAJOR PROPORTION OF THE PARTICLES OF SUBSTANTIALLY COLLOIDAL DIMENSIONS AND SUBSTANTIALLY FREE FROM INORGANIC NON-VOLATILE MATTER WHICH COMPRISES TREATING SILVER OXIDE WITH A PRECIPITATED PROTEIN HYDROLYSIS PRODUCT, SUBSTANTIALLY FREE FROM NON-VOLATILE INORGANIC MATTER AND HAVING A MOLECULAR WEIGHT OF AT LEAST THREE HUNDRED, IN THE PRESENCE OF AN ORGANIC BASE STRONGER THAN AMMONIA WHICH IS VOLATILISABLE BELOW 300* C. AND IS FREE FROM HALOGENS AND THIOL GROUPS.
Claim 2
Dependent Claim
82 words
A PROCESS FOR THE PRODUCTION OF A STABLE COMPOSITION CONTAINING FINELY-DIVIDED METALLIC SILVER HAVING A MAJOR PROPORTION OF THE PARTICLES OF SUBSTANTIALLY COLLOIDAL DIMENSIONS AND SUBSTANTIALLY FREE FROM INORGANIC NON-VOLATILE MATTER WHICH COMPRISES TREATING SILVER OXIDE WITH A PRECIPITATED PROTEIN HYDROLYSIS PRODUCT, SUBSTANTIALLY FREE FROM NON-VOLATILE INORGANIC MATTER AND HAVING A MOLECULAR WEIGHT OF AT LEAST THREE HUNDRED, IN THE PRESENCE OF AN ORGANIC BASE STRONGER THAN AMMONIA WHICH IS VOLATILISABLE BELOW 300* C. AND IS FREE FROM HALOGENS AND THIOL GROUPS.
Claim 3
Dependent Claim
55 words
A NEW COMPOSITION OF MATTER CONSISTING OF FINELY DIVIDED METALLIC SILVER HAVING A MAJOR PROPORTION OF THE PARTICLES OF SUBSTANTIALLY COLLODIAL DIMENSIONS, A REDUCING PROTEIN HYDROLYSATE AND AN ORGANIC BASIC REDUCING AGENT WHICH IS VOLATILISABLE BELOW 300* C. AND FREE FROM HALOGENS AND THIOL GROUPS, SAID FINELY DIVIDED SILVER BEING FREE FROM OTHER METALLIC DERIVATIVES.
Claim 4
Dependent Claim
55 words
A NEW COMPOSITION OF MATTER CONSISTING OF FINELY DIVIDED METALLIC SILVER HAVING A MAJOR PROPORTION OF THE PARTICLES OF SUBSTANTIALLY COLLODIAL DIMENSIONS, A REDUCING PROTEIN HYDROLYSATE AND AN ORGANIC BASIC REDUCING AGENT WHICH IS VOLATILISABLE BELOW 300* C. AND FREE FROM HALOGENS AND THIOL GROUPS, SAID FINELY DIVIDED SILVER BEING FREE FROM OTHER METALLIC DERIVATIVES.
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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) | 1955-04-15 | 1955-10-15 | 1956-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-15 | 1959-10-15 | 1960-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-15 | 1963-10-15 | 1964-04-15 | $7700.00 | Window Closed / Lapsed |