Patent US3190803A successfully refreshed from Google Patents.
US3190803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pvp-formamidine sulfinic acid color stripping medium
Assignee: Individual
•
Filing: 1962-07-24
•
Granted: 1965-06-22
•
Expires: 1982-07-24
Abstract
No abstract record available.
Inventors
- 👤 Vogt Gunther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:00
CPC Classifications
A; A61; A61Q; A61Q5/00; A61Q5/08; A61K; A61K8/00; A61K8/18; A61K8/30; A61K8/33; A61K8/34; A61K8/46; A61K8/72; A61K8/81; A61K8/817; A61K8/8176; C; C08; C08K; C08K5/00; C08K5/36; C08K5/41; D; D06; D06P; D06P5/00; D06P5/13; D06P5/138; A61K2800/00; A61K2800/40; A61K2800/52; Y; Y10; Y10S; Y10S424/00; Y10S424/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
46 words
A COLOR STRIPPING MEDIUM CONSISTING OF AN AQUEOUS ALKALINE SOLUTION OF ABOUT 1 TO 2 PERCENT OF FORMAMIDINE SULFINIC ACID AND OF 5 TO 8 PERCENT OF POLYVINYL PYRROLIDONE, THE PERCENTAGES BEING BY WEIGHT OF THE SOLUTION, AND THE PH OF THE SOLUTION NOT EXCEEDING 9.
Claim 2
Dependent Claim
46 words
A COLOR STRIPPING MEDIUM CONSISTING OF AN AQUEOUS ALKALINE SOLUTION OF ABOUT 1 TO 2 PERCENT OF FORMAMIDINE SULFINIC ACID AND OF 5 TO 8 PERCENT OF POLYVINYL PYRROLIDONE, THE PERCENTAGES BEING BY WEIGHT OF THE SOLUTION, AND THE PH OF THE SOLUTION NOT EXCEEDING 9.
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) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |