US3629048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reinforced paper sheeting
Assignee: Hercules LLC
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Filing: 1970-02-27
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Granted: 1971-12-21
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Expires: 1990-02-27
Abstract
Abstract Disclosed is reinforced paper sheeting having high resistance to tear. An assembly is prepared by sandwiching a nonwoven scrim between at least two plies of undried water-laid woodpulp fibers. The assembly is then subjected to moderate pressure and subsequently dried.
Inventors
- 👤 Robert W Davison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:54
CPC Classifications
B; B32; B32B; B32B29/00; B32B29/02; D; D21; D21H; D21H27/00; D21H27/30; D21H27/32; D21H27/34; D21H27/36; B32B5/00; B32B5/02; B32B5/022; B32B2262/00; B32B2262/02; B32B2262/0253; B32B2307/00; B32B2307/70; B32B2307/73; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24058; Y10T428/24074; Y10T428/24091; Y10T428/24099; Y10T442/00; Y10T442/10; Y10T442/184
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
35 words
The nonwoven fabric of claim 1 when the strands of one of the webs of the scrim make an angle of between about 45* and 90* with the strands of at least one other web.
Claim 2
Dependent Claim
30 words
The nonwoven fabric of claim 2 wherein at least one of the webs of which the scrim is comprised is a fibrillated striated film of a synthetic thermoplastic hydrophobic material.
Claim 3
Dependent Claim
17 words
The nonwoven fabric of claim 3 wherein the synthetic thermoplastic hydrophobic material is a polymer of propylene.
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) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |