Patent US3205202A successfully refreshed from Google Patents.
US3205202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for improving the brightness of synthetic polymers and products resulting therefrom
Assignee: Bayer AG
•
Filing: 1956-08-07
•
Granted: 1965-09-07
•
Expires: 1976-08-07
Abstract
No abstract record available.
Inventors
- 👤 Schnegg Robert
- 👤 Istel Erich
- 👤 Gold Heinrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 15:17
CPC Classifications
D; D01; D01F; D01F1/00; D01F1/02; D01F1/06; C; C07; C07D; C07D249/00; C07D249/16; C07D249/22; C07D249/24; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/30; C08G18/38; C08G18/3855; C08G63/00; C08G63/68; C08G63/688; C08G63/6884; C08G69/00; C08G69/42; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
IN A PROCESS FOR PRODUCING A SYNTHETIC POLYMER COMPRISING POLYMERIZING CAPROLACTAM IN THE PRESENCE OF A MINOR AMOUNTS OF A PIGMENT AND AN ACID AT A TEMPERATURE OF ABOUT 260*C. AND UNDER PRESSURE IN AN AUTOCLAVE, THE IMPROVEMENT COMPRISING INCORPORATING THE REACTION MIXTURE AN OPTICAL BLEACHING AGENT SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
53 words
IN A PROCESS FOR PRODUCING A SYNTHETIC POLYMER COMPRISING POLYMERIZING CAPROLACTAM IN THE PRESENCE OF A MINOR AMOUNTS OF A PIGMENT AND AN ACID AT A TEMPERATURE OF ABOUT 260*C. AND UNDER PRESSURE IN AN AUTOCLAVE, THE IMPROVEMENT COMPRISING INCORPORATING THE REACTION MIXTURE AN OPTICAL BLEACHING AGENT SELECTED FROM THE GROUP CONSISTING OF
References Cited (Backward Citations)
US2666062A
Cited
US2498592A
Cited
US2668777A
Cited
US2498593A
Cited
US2657195A
Cited
US2630421A
Cited
US2739139A
Cited
US2784183A
Cited
US2747997A
Cited
US2732301A
Cited
US2875047A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-06 | 1969-03-08 | 1969-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-06 | 1973-03-08 | 1973-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-06 | 1977-03-08 | 1977-09-07 | $7700.00 | Window Closed / Lapsed |