US3725196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fibrous base felt containing cellulosic fibers, 10% to 50% asbestos fibers, and 1% to 5% of water soluble cationic polyacrylic resin as a drainage aid
Assignee: Congoleum Corp
•
Filing: 1970-04-08
•
Granted: 1973-04-03
•
Expires: 1990-04-08
Abstract
Abstract A fibrous base felt which includes cellulosic fibers, 10 percent to 50 percent asbestos fibers, and 1 percent to 5 percent of water soluble cationic polyacrylic resin is produced by separately forming a cellulosic fibrous slurry and an asbestos fibrous slurry, adding the polyacrylic resin to the asbestos fibrous slurry, mixing the slurries, and thereafter forming and drying the produced felt. Binders may be employed to saturate the felt subsequent to drying.
Inventors
- 👤 D Winters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:03
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/36; D21H13/38; D21H13/42; D21H11/00; D21H17/00; D21H17/20; D21H17/33; D21H5/00; D21H5/12; D21H5/18; D21H5/183
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A method of making a fibrous base felt as in claim 1 and wherein: a. said cellulosic fibers include a mixture of kraft and rag fibers.
Claim 2
Dependent Claim
9 words
The product produced by the method of claim 1.
References Cited (Backward Citations)
US2868641A
Cited
US3270846A
Cited
US3441474A
Cited
US3480847A
Cited
US3562097A
Cited
US3554860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |