US3770562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite nonwoven fabrics
Assignee: Fiber Technology Corp
•
Filing: 1971-09-09
•
Granted: 1973-11-06
•
Expires: 1991-09-09
Abstract
Abstract A soft and flexible spun-bond web having a cantilever drape index of not over 1.25 inches in machine or cross direction is impregnated with a soft thermoplastic binder, dried, and then plied by heat and pressure to at least one substantially binderfree fibrous layer at a temperature insufficient to cause autogenous fusion of the filaments of the spun-bond web but sufficient to cause bonding of the fibers of the fibrous layer to each other and to the spun-bond web.
Inventors
- 👤 N Newman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:21
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/24; B32B5/26; D; D04; D04H; D04H5/00; D04H5/04; B32B2260/00; B32B2260/02; B32B2260/021; B32B2260/04; B32B2260/046; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2262/0261; B32B2262/0276; B32B2262/06; B32B2262/062; B32B2437/00; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2352; Y10T442/2738; Y10T442/2746; Y10T442/60; Y10T442/659; Y10T442/66; Y10T442/681
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
23 words
The product according to claim 1 wherein said spun-bond web comprises filaments selected from the class consisting of polyester, polyamide, and polypropylene filaments.
Claim 2
Dependent Claim
20 words
The product according to claim 1 wherein said at least one additional fibrous layer is a layer of textile-length fibers.
Claim 3
Dependent Claim
21 words
The product according to claim 1 wherein the fibrous layer bonded to the spun-bond web is a layer of cellulose tissue.
Claim 4
Dependent Claim
31 words
The product according to claim 1 wherein said spun-bonded web is prebonded at between 5 percent and 10 percent of the filament crossover points prior to impregnation with the binder material.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |