US4941947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite fibrous polyethylene sheet
Assignee: EIDP Inc
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Filing: 1989-09-29
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Granted: 1990-07-17
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Expires: 2009-09-29
Abstract
Abstract A bonded composite sheet comprising a layer of flash-spun polyethylene plexifilamentary film-fibril strand sheet in face-to-face contact with a layer of polyethylene synthetic pulp is highly suited for detailed printing thereon.
Inventors
- 👤 Joseph R. Guckert
- 👤 Hyun S. Lim
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:46
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/10; D21H13/12; D21H13/14; D21F; D21F11/00; D21F11/02; D21F11/04; D21H27/00; D21H27/30; D21H27/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
86 words
A process for preparing a composite sheet comprising: depositing polyethylene synthetic pulp on the forming wire of a paper-making machine to form a wet-laid pulp layer, placing a lightly consolidated flash-spun polyethvlene plexifilamentary film-fibril strand sheet atop the wet pulp layer at a point in the paper-making machine where the pulp layer has a water content in the range of 99 to 50% by total weight of the layer to form a sheet assembly, and then dewatering and drying the assembly to form a composite sheet.
Claim 2
Dependent Claim
86 words
A process for preparing a composite sheet comprising: depositing polyethylene synthetic pulp on the forming wire of a paper-making machine to form a wet-laid pulp layer, placing a lightly consolidated flash-spun polyethvlene plexifilamentary film-fibril strand sheet atop the wet pulp layer at a point in the paper-making machine where the pulp layer has a water content in the range of 99 to 50% by total weight of the layer to form a sheet assembly, and then dewatering and drying the assembly to form a composite sheet.
Claim 3
Dependent Claim
40 words
A process in accordance with claim 1 wherein the water content of the wet pulp layer at the point of initial contact between the plexifilamentary strand sheet and the wet pulp layer is in the range of 98.5 to 94%.
Claim 4
Dependent Claim
44 words
A process of claim 2 wherein a light load is maintained normal to the surface of the lightly consolidated plexifilamentary strand sheet after the sheet has been brought into contact with the wet pulp layer and while the thusly formed assembly is being dewatered.
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) | 1993-07-16 | 1994-01-15 | 1994-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-16 | 1998-01-15 | 1998-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-16 | 2002-01-15 | 2002-07-17 | $7700.00 | Window Closed / Lapsed |