Patent US3201223A successfully refreshed from Google Patents.
US3201223A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparation of silver powder having a protective gum coating
Assignee: Tesla AS
•
Filing: 1963-11-06
•
Granted: 1965-08-17
•
Expires: 1983-11-06
Abstract
No abstract record available.
Inventors
- 👤 Cuhra Bohuslav
- 👤 Gruner Karel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:03
CPC Classifications
H; H01; H01B; H01B1/00; H01B1/20; H01B1/22; B; B22; B22F; B22F9/00; B22F9/16; B22F9/18; B22F9/20; B22F9/24; C; C01; C01G; C01G5/00; C01G5/003; C03; C03C; C03C17/00; C03C17/06; C22; C22B; C22B11/00; C22B11/04; C22B3/00; C22B3/20; C22B3/26; C22B3/306; H01B1/02; C03C2217/00; C03C2217/20; C03C2217/25; C03C2217/251; C03C2218/00; C03C2218/10; C03C2218/17; Y; Y02; Y02P; Y02P10/00; Y02P10/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
A METHOD OF PREPARING SMALL SILVER PARTICLES WHICH ARE SUITABLE FOR USE TO COAT THE SURFACE OF MATERIALS, WHICH METHOD COMPRISES DISSOLVING IN ONE LITER OF DISTILLED WATER BETWEEN 400 AND 600 GRAMS OF SILVER NITRATE AND A SUFFICIENT AMOUNT OF ALKALI HYDROXIDE TO REACT WITH THE SILVER NITRATE TO FORM A PRECIPITATE OF SILVER OXIDE, ADDING SUFFICIENT FORMALDEHYDE TO REDUCE THE SILVER OXIDE TO METALLIC SILVER IN TWO PHASES, AND A WATER SOLUBLE PARTICLE PROTECTIVE GUM, FIRST HEATING THE MIXTURE TO AND MAINTAINING THE SAME AT 20* TO 40*C. TO FORM SILVER FORMATE, AND THEN HEATING THE MIXTURE TO AND MAINTAINING THE SAME AT 40* TO 70*C. TO DISSOCIATE THE FORMATE RADICAL TO PRODUCE GUM PROTECTED METALLIC SILVER PARTICLES, AND RECOVERING THE PARTICLES.
Claim 2
Independent Claim
124 words
A METHOD OF PREPARING SMALL SILVER PARTICLES WHICH ARE SUITABLE FOR USE TO COAT THE SURFACE OF MATERIALS, WHICH METHOD COMPRISES DISSOLVING IN ONE LITER OF DISTILLED WATER BETWEEN 400 AND 600 GRAMS OF SILVER NITRATE AND A SUFFICIENT AMOUNT OF ALKALI HYDROXIDE TO REACT WITH THE SILVER NITRATE TO FORM A PRECIPITATE OF SILVER OXIDE, ADDING SUFFICIENT FORMALDEHYDE TO REDUCE THE SILVER OXIDE TO METALLIC SILVER IN TWO PHASES, AND A WATER SOLUBLE PARTICLE PROTECTIVE GUM, FIRST HEATING THE MIXTURE TO AND MAINTAINING THE SAME AT 20* TO 40*C. TO FORM SILVER FORMATE, AND THEN HEATING THE MIXTURE TO AND MAINTAINING THE SAME AT 40* TO 70*C. TO DISSOCIATE THE FORMATE RADICAL TO PRODUCE GUM PROTECTED METALLIC SILVER PARTICLES, AND RECOVERING THE PARTICLES.
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) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |