US2974003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of wool with isocyanates in the presence of dimethylformamide
Assignee: Individual
•
Filing: 1959-07-14
•
Granted: 1961-03-07
•
Expires: 1979-07-14
Abstract
No abstract record available.
Inventors
- 👤 Nathan H Koenig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:51
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/322; D06M13/395
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A PROCESS FOR CHEMICALLY MODIFYING WOOL WHICH COMPRISES REACTING WOOL UNDER ESSENTIALLY ANHYDROUS CONDITIONS, IN THE PRESENCE OF DIMETHYLFORMAMIDE, WITH AN ORGANIC ISOCYANATE OF THE CLASS CONSISTING OF ALIPHATIC, AROMATIC, AND AROMATIC-ALIPHATIC ISOCYANATES AT A TEMPERATURE ABOUT FROM 25 TO 150* C. UNTIL THE WOOL COMBINES WITH ABOUT FROM 1 TO 70% OF ITS WEIGHT OF THE ISOCYANATE.
Claim 2
Dependent Claim
58 words
A PROCESS FOR CHEMICALLY MODIFYING WOOL WHICH COMPRISES REACTING WOOL UNDER ESSENTIALLY ANHYDROUS CONDITIONS, IN THE PRESENCE OF DIMETHYLFORMAMIDE, WITH AN ORGANIC ISOCYANATE OF THE CLASS CONSISTING OF ALIPHATIC, AROMATIC, AND AROMATIC-ALIPHATIC ISOCYANATES AT A TEMPERATURE ABOUT FROM 25 TO 150* C. UNTIL THE WOOL COMBINES WITH ABOUT FROM 1 TO 70% OF ITS WEIGHT OF THE ISOCYANATE.
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) | 1964-03-06 | 1964-09-05 | 1965-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-03-06 | 1968-09-05 | 1969-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-03-06 | 1972-09-05 | 1973-03-07 | $7700.00 | Window Closed / Lapsed |