US2666738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bright silver plating
Assignee: Hanson Van Winkle Munning Co
•
Filing: 1950-09-15
•
Granted: 1954-01-19
•
Expires: 1970-09-15
Abstract
No abstract record available.
Inventors
- 👤 Kardos Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:28
CPC Classifications
C; C25; C25D; C25D3/00; C25D3/02; C25D3/46
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
94 words
A PROCESS FOR PRODUCING BRIGHT SILVER ELECTRODEPOSITS, WHICH COMPRISES ELECTRODEPOSITING SILVER FROM AN AQUEOUS CYANIDE SILVER PLATING BATH CONTAINING 0.02 TO 0.04 OZ./GAL. (0.15 TO 0.30 G./LITER) OF THE SOLID, WATER- AND ACID INSOLUBLE BUT ALKALI SOLUBLE REACTION PRODUCT OF A KETONE OF THE FORMULA RC2COCH3, WHERE R COMPRISES A SUBSTITUENT SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL, ACETONYL (CH3COCH2-) AND ALKALI METAL CARBOXYMETHYL (-CH2COONA, -CH2COOK), WITH CARBON DISULFIDE AND ALKALI HYDROXIDE, THIS REACTION PRODUCT HAVING BEEN PRECIPITATED BY ADDITION OF A STRONG MINERAL ACID AND FREED FROM ALKALI SULFIDE AND HYDROGEN SULFIDE
Claim 2
Dependent Claim
94 words
A PROCESS FOR PRODUCING BRIGHT SILVER ELECTRODEPOSITS, WHICH COMPRISES ELECTRODEPOSITING SILVER FROM AN AQUEOUS CYANIDE SILVER PLATING BATH CONTAINING 0.02 TO 0.04 OZ./GAL. (0.15 TO 0.30 G./LITER) OF THE SOLID, WATER- AND ACID INSOLUBLE BUT ALKALI SOLUBLE REACTION PRODUCT OF A KETONE OF THE FORMULA RC2COCH3, WHERE R COMPRISES A SUBSTITUENT SELECTED FROM THE GROUP CONSISTING OF HYDROGEN, ALKYL, ACETONYL (CH3COCH2-) AND ALKALI METAL CARBOXYMETHYL (-CH2COONA, -CH2COOK), WITH CARBON DISULFIDE AND ALKALI HYDROXIDE, THIS REACTION PRODUCT HAVING BEEN PRECIPITATED BY ADDITION OF A STRONG MINERAL ACID AND FREED FROM ALKALI SULFIDE AND HYDROGEN SULFIDE
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) | 1957-01-18 | 1957-07-20 | 1958-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-18 | 1961-07-20 | 1962-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-18 | 1965-07-20 | 1966-01-19 | $7700.00 | Window Closed / Lapsed |