US2752237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silver powder and method for producing same
Assignee: EIDP Inc
•
Filing: 1955-06-13
•
Granted: 1956-06-26
•
Expires: 1975-06-13
Abstract
No abstract record available.
Inventors
- 👤 Oliver A Short
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 01:04
CPC Classifications
B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; C; C22; C22B; C22B11/00; C22B11/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
15 words
A PRECIPITATED SILVER POWDER HAVING AN APPARENT DENSITY OF 2 TO 5 GRAMS PER CC.
Claim 2
Dependent Claim
15 words
A PRECIPITATED SILVER POWDER HAVING AN APPARENT DENSITY OF 2 TO 5 GRAMS PER CC.
Claim 3
Dependent Claim
113 words
IN A PROCESS FOR THE PREPARATION OF PRECIPITATED SILVER THE STEP WHICH COMPRISES ADDING TO AN AQUEOUS SILVER NITRATE SOLUTION CONTAINING BETWEEN 550 AND 940 GRAMS PER LITER OF SILVER, (CALCULATED AS METALLIC SILVER) AND BETWEEN 1.0 AND 35 GRAMS PER LITER OF THE RESIDUAL NITRIC ACID, SUCH A QUANTITY OF AN ALKALI METAL SALT TAKEN FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM CARBONATES, BICARBONATES AND HYDROXIDES IN EXCESS OF THAT WHICH WILL PRECIPITATE SUBSTANTIALLY ALL OF THE SILVER FROM SAID SOLUTION AND WILL REACT WITH SUBSTANTIALLY ALL OF THE NITRIC ACID AS WILL CONSTITUTE THE ALKALINE EQUIVALENCE OF BETWEEN 0.5% AND 25% BY WEIGHT OF SAID SILVER CONTENT OF SODIUM CARBONATE.
Claim 4
Dependent Claim
113 words
IN A PROCESS FOR THE PREPARATION OF PRECIPITATED SILVER THE STEP WHICH COMPRISES ADDING TO AN AQUEOUS SILVER NITRATE SOLUTION CONTAINING BETWEEN 550 AND 940 GRAMS PER LITER OF SILVER, (CALCULATED AS METALLIC SILVER) AND BETWEEN 1.0 AND 35 GRAMS PER LITER OF THE RESIDUAL NITRIC ACID, SUCH A QUANTITY OF AN ALKALI METAL SALT TAKEN FROM THE GROUP CONSISTING OF SODIUM AND POTASSIUM CARBONATES, BICARBONATES AND HYDROXIDES IN EXCESS OF THAT WHICH WILL PRECIPITATE SUBSTANTIALLY ALL OF THE SILVER FROM SAID SOLUTION AND WILL REACT WITH SUBSTANTIALLY ALL OF THE NITRIC ACID AS WILL CONSTITUTE THE ALKALINE EQUIVALENCE OF BETWEEN 0.5% AND 25% BY WEIGHT OF SAID SILVER CONTENT OF SODIUM CARBONATE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-26 | 1959-12-26 | 1960-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-26 | 1963-12-26 | 1964-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-26 | 1967-12-26 | 1968-06-26 | $7700.00 | Window Closed / Lapsed |