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US4957805A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of making laminated reinforced thermoplastic sheets and articles made therefrom

Assignee: Wiggins Teape Group Ltd
•
Filing: 1988-07-11
•
Granted: 1990-09-18
•
Expires: 2008-07-11
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Abstract

Abstract Laminated reinforced thermoplastic sheets are made by preparing first and second porous sheets, each having 20% to 60% by weight of reinforcing fibers having a high modulus of elasticity and 40% to 80% by weight of a thermoplastic material differing from the thermoplastic material in the other sheet and applying heat and pressure to cause the sheets to consolidate and adhere together to form the laminate.

Inventors

  • 👤 Ian S. Biggs
  • 👤 Bronislaw Radvan

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-08 05:02
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/28; B29C70/40; B29C70/42; B29C70/46; B32; B32B; B32B27/00; B32B27/06; B32B27/065; B32B27/08; B32B27/18; B32B27/20; B32B27/28; B32B27/285; B32B27/288; B32B27/30; B32B27/304; B32B27/34; B32B27/36; B32B27/365; B32B37/00; B32B37/04; B32B38/00; B32B38/0036; B32B38/16; B32B38/164; B32B5/00; B32B5/18; B32B5/20; B32B5/22; B32B5/24; B32B5/26; B32B7/00; B32B7/02; B29K; B29K2101/00; B29K2101/12; B29K2105/00; B29K2105/06; B29K2105/12; B32B2262/00; B32B2262/10; B32B2262/101; B32B2305/00; B32B2305/08; B32B2305/22; B32B2307/00; B32B2307/50; B32B2307/51; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044; Y10T156/1048; Y10T428/00; Y10T428/249921; Y10T428/249923; Y10T428/249953; Y10T428/249981; Y10T442/00; Y10T442/60; Y10T442/674

Claims Analysis

Total Claims: 11
Claim 1
Independent Claim 166 words
A method of making laminated reinforced thermoplastic sheets which includes preparing first and second unconsolidated porous sheets each comprising 20% to 60% by weight of reinforcing fibers having a high modulus of elasticity and 40% to 80% by weight of a thermoplastic material differing from the thermoplastic material in the other sheet, placing the sheets together so that projecting fibers from the adjacent sheets interengage in a boundary zone, and applying heat and pressure to cause the sheets to consolidate and adhere together to form a laminate in which the unconsolidated sheets are formed and dried together by making a first stock of reinforcing fibers and the first thermoplastic material in particulate form, depositing that first stock on the wire of a papermaking machine, partially draining that first stock, making a second stock of reinforcing fibers and the second thermoplastic material in particulate form, depositing that second stock on top of the partially drained first stock, draining the two stocks, and drying the two stocks together.
Claim 2
Independent Claim 166 words
A method of making laminated reinforced thermoplastic sheets which includes preparing first and second unconsolidated porous sheets each comprising 20% to 60% by weight of reinforcing fibers having a high modulus of elasticity and 40% to 80% by weight of a thermoplastic material differing from the thermoplastic material in the other sheet, placing the sheets together so that projecting fibers from the adjacent sheets interengage in a boundary zone, and applying heat and pressure to cause the sheets to consolidate and adhere together to form a laminate in which the unconsolidated sheets are formed and dried together by making a first stock of reinforcing fibers and the first thermoplastic material in particulate form, depositing that first stock on the wire of a papermaking machine, partially draining that first stock, making a second stock of reinforcing fibers and the second thermoplastic material in particulate form, depositing that second stock on top of the partially drained first stock, draining the two stocks, and drying the two stocks together.
Claim 3
Dependent Claim 22 words
A method as claimed in claim 1 in which at least one sheet is of high fiber content and remains partially unconsolidated.
Claim 4
Dependent Claim 24 words
A method as claimed in claim 1 in which at least one sheet is of high fiber content and remains partially expanded after consolidation.
Claim 5
Dependent Claim 29 words
A method as claimed in claim 1 in which a substantial proportion of the fibers are between 7 and 50 millimeters long and 13 microns or less in diameter.
Claim 6
Dependent Claim 20 words
A method as claimed in claim 1 in which the fibers are in the form of single discrete glass fibers.
Claim 7
Dependent Claim 28 words
A method as claimed in claim 5 in which the discrete glass fibers are not shorter than about 7 millimeters or of a diameter greater than 13 microns.
Claim 8
Dependent Claim 39 words
A method as claimed in claim 1 in which the thermoplastic materials are polyethylene, polypropylene, polystyrene, acrylonitrilestyrenebutadiene, polyethyleneterephthalate, polybutyleneterephthalate, or polyvinylchloride, both plasticized and unplasticized or alloys or blends of these materials with each other or other polymeric materials.
Claim 9
Dependent Claim 57 words
A method as claimed in claim 1 in which the thermoplastic materials are polyphenylene ether or polycarbonates or polyestercarbonates or thermoplastic polyesters or polyetherimides or acrylonitrile-butylacrylate-styrene polymers or amorphous nylon or polyarylene ether ketone or alloys or blends of these materials ether ketone or alloys or blends of these materials with each other or other polymeric materials.
Claim 10
Dependent Claim 20 words
An article made from laminated sheets as set forth in claim 1 which has been made by heating and molding.
Claim 11
Dependent Claim 10 words
An article made according to the method of claim 8.

References Cited (Backward Citations)

US1875018A Cited
US1901382A Cited
GB448138A Cited
US2388187A Cited
US2653870A Cited
GB729381A Cited
US2892107A Cited
US2795524A Cited
US2962414A Cited
GB855132A Cited
US3042574A Cited
GB871117A Cited
US3216841A Cited
GB1058932A Cited
US3573158A Cited
US3428518A Cited
US3489827A Cited
US3396062A Cited
CH462024A Cited
US3494824A Cited
GB1134785A Cited
GB1198324A Cited
US3897533A Cited
US4153760A Cited
GB1204039A Cited
US3452128A Cited
GB1230789A Cited
GB1231937A Cited
US3607500A Cited
GB1263812A Cited
GB1353477A Cited
GB1330485A Cited
US3856614A Cited
US3832115A Cited
US3873336A Cited
US3980511A Cited
US3850723A Cited
GB1412642A Cited
US3865661A Cited
US3903343A Cited
US4044188A Cited
GB1373782A Cited
US3980613A Cited
US4007083A Cited
US3930917A Cited
GB1519310A Cited
US4104340A Cited
US4081318A Cited
US4104435A Cited
US4159294A Cited
US4469543A Cited
US4327164A Cited
GB2051170A Cited
JPS5637373A Cited
US4339490A Cited
US4286977A Cited
GB2093474A Cited
US4503116A Cited
US4359132A Cited
US4451539A Cited
EP0071219A1 Cited
US4393154A Cited
US4481248A Cited
US4555426A Cited
GB2147850A Cited
EP0152994A2 Cited
US4670331A Cited
US4543288A Cited
EP0148760A2 Cited
EP0148763A2 Cited
US4734321A Cited
US4543288B1 Cited
US4690860A Cited
DE3420195A1 Cited
US4595617A Cited
US4643940A Cited
US4543283A Cited
US4568581A Cited
US4659528A Cited
US4719039A Cited
US4649014A Cited
US4663225A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1993-09-17 1994-03-19 1994-09-18 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1997-09-17 1998-03-19 1998-09-18 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2001-09-17 2002-03-19 2002-09-18 $7700.00 Window Closed / Lapsed

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