US3694301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrophilic nonwoven web and method of making it
Assignee: 3M Co
•
Filing: 1971-01-04
•
Granted: 1972-09-26
•
Expires: 1991-01-04
Abstract
Abstract THE DISCLOSED HYDROPHILIC WEBS ARE OBTAINED BY IMPREGNATING NONWOVEN WEBS WITH AN ISOCYANATE-TERMINATED PREPOLYMER AND FOAMING THE PREPOLYMER IN SITU WITH WATER OR STEAM. THE PREPOLYMER IS PREFERABLY DERIVED FROM AN AROMATIC DIISOCYANATE AND A POLYOXYETHYLENE DIOL HAVING AN OH EQUIVALENT WEIGHT OF 300-2,200. THE RESULTING WEBS HAVE GOOD STRENGTH (ADEQUATE FOR USE IN LEATHER SUBSTITUTES), AND LOW STIFFNESS (TEMPER) PROPERTIES. WHEN THE WEB IS MOIST, THE STRENGTH PROPERTIES ARE SUBSTANTIALLY RETAINED, THE STIFFNESS IS EVEN LOWER.
Inventors
- 👤 Larry E Gruenewald
- 👤 John F Kistner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 18:29
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/12; C; C08; C08G; C08G18/00; C08G18/06; C08G18/28; C08G18/40; C08G18/48; C08G18/4833; B32B27/40; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/68; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/564; D06M15/568; D06N; D06N3/00; D06N3/12; D06N3/14; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2305/00; B32B2305/02; B32B2305/026; B32B2307/00; B32B2307/70; B32B2307/728; Y; Y10; Y10S; Y10S521/00; Y10S521/905; Y10S521/918; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249978; Y10T428/249979; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T442/00; Y10T442/60; Y10T442/647; Y10T442/652
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-09-26 | 1976-03-27 | 1976-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-26 | 1980-03-27 | 1980-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-26 | 1984-03-27 | 1984-09-26 | $7700.00 | Window Closed / Lapsed |