US4082882A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiberglass reinforced plywood structural sandwich with acrylic facing on one or both sides thereof
Assignee: Delta Truck Body Co Inc
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Filing: 1975-08-13
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Granted: 1978-04-04
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Expires: 1995-08-13
Abstract
Abstract A structural sandwich for use as a truck, trailer, van or intermodal container wall and method of making the same. The sandwich comprises a fiberglass reinforced plywood plastic unit having one or both facings which are in the form of a sheet or film of a high-impact, weather-resistant, low-haze, non-brittle, substantially non-porous acrylic composition, the unit being made into an integrated sandwich of 20 foot lengths or more by an efficient vacuum molding method.
Inventors
- 👤 Hyman Weinstein
- 👤 Kurt Adler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:11
CPC Classifications
B; B32; B32B; B32B21/00; B32B21/04; B32B21/08; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/08; B29C70/088; B32B27/00; B32B27/12; B62; B62D; B62D29/00; B62D29/04; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0809; B29K2309/00; B29K2309/08; B29K2711/00; B29K2711/14; B32B2305/00; B32B2305/08; B32B2307/00; B32B2307/50; B32B2307/558; B32B2307/70; B32B2307/712; B32B2605/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31786; Y10T428/31797; Y10T428/31855; Y10T428/3188; Y10T428/31895; Y10T428/31971; Y10T428/31989; Y10T442/00; Y10T442/30; Y10T442/3854
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
110 words
A sandwich for use as a structural wall of a truck, trailer, van or intermodal container comprised of a consolidated unit including a layer in the form of a sheet of an alkyl methacrylate polymer having all acrylic multiple stage modifiers, the polymer being sequentially produced and characterized by a non-elastomeric hard first stage, an intermediate elastomeric stage and final relatively hard stage, a polyester resin bonded to said acrylic sheet, a ply of fiberglass in the form of a waffle weave of woven roving embedded in and covered by said resin and plywood bonded to said resin on the side of said fiberglass opposite said layer of acrylic composition.
Claim 2
Dependent Claim
110 words
A sandwich for use as a structural wall of a truck, trailer, van or intermodal container comprised of a consolidated unit including a layer in the form of a sheet of an alkyl methacrylate polymer having all acrylic multiple stage modifiers, the polymer being sequentially produced and characterized by a non-elastomeric hard first stage, an intermediate elastomeric stage and final relatively hard stage, a polyester resin bonded to said acrylic sheet, a ply of fiberglass in the form of a waffle weave of woven roving embedded in and covered by said resin and plywood bonded to said resin on the side of said fiberglass opposite said layer of acrylic composition.
Claim 3
Dependent Claim
28 words
The sandwich of claim 1 wherein said resin is a catalyzed composition including a polymer of propylene glycol, maleic anhydride and phthalic anhydride, styrene monomer and curing promoters.
Claim 4
Dependent Claim
37 words
The sandwich of claim 1 and a layer of pigmented resin over said plywood and a further ply of fiberglass in the form of a waffle weave of woven roving embedded in and covered by said resin.
Claim 5
Dependent Claim
28 words
The sandwich of claim 3 and a further acrylic sheet over said further ply of fiberglass and consolidated therewith in the resin covering said further ply of fiberglass.
Claim 6
Dependent Claim
111 words
A sandwich for use as a structural wall of a truck, trailer, van or intermodal container comprised of a consolidated unit including a layer in the form of a film of multiple stage acrylic polymers in which the polymer particles have rubbery cross-linked cores of alkyl acrylates at least partially sheathed by harder copolymer sheaths of alkyl acrylates with some penetration between the layers, a polyester resin bonded to said acrylic film, a ply of fiberglass in the form of a waffle weave of woven roving embedded in and covered by said resin and plywood bonded to said resin on the side of the fiberglass opposite said layer of acrylic film.
Claim 7
Dependent Claim
111 words
A sandwich for use as a structural wall of a truck, trailer, van or intermodal container comprised of a consolidated unit including a layer in the form of a film of multiple stage acrylic polymers in which the polymer particles have rubbery cross-linked cores of alkyl acrylates at least partially sheathed by harder copolymer sheaths of alkyl acrylates with some penetration between the layers, a polyester resin bonded to said acrylic film, a ply of fiberglass in the form of a waffle weave of woven roving embedded in and covered by said resin and plywood bonded to said resin on the side of the fiberglass opposite said layer of acrylic film.
Claim 8
Independent Claim
166 words
A method of making a sandwich for use as a structural wall of a truck, trailer, van or intermodal container comprised of applying a polyester resin to a sheet or film of a high-impact, non-brittle, non-porous, weather-resistant acrylic composition, said sheet being made of an alkyl methacrylate polymer having all acrylic multiple stage modifiers, the polymer being sequentially produced and characterized by a non-elastomeric hard first stage, an intermediate elastomeric stage and final relatively hard stage, said film being made of multiple stage acrylic polymers in which the polymer particles have rubbery cross-linked cores of alkyl acrylates at least partially sheathed by harder copolymer sheaths of alkyl acrylates with some penetration between the layers, embedding a ply of fiberglass in the form of a waffle weave of woven roving in said resin, placing plywood against said resin on the side of the plywood opposite the acrylic sheet or film and applying vacuum to the composite unit at room temperature until a consolidated laminated sandwich is produced.
Claim 9
Independent Claim
166 words
A method of making a sandwich for use as a structural wall of a truck, trailer, van or intermodal container comprised of applying a polyester resin to a sheet or film of a high-impact, non-brittle, non-porous, weather-resistant acrylic composition, said sheet being made of an alkyl methacrylate polymer having all acrylic multiple stage modifiers, the polymer being sequentially produced and characterized by a non-elastomeric hard first stage, an intermediate elastomeric stage and final relatively hard stage, said film being made of multiple stage acrylic polymers in which the polymer particles have rubbery cross-linked cores of alkyl acrylates at least partially sheathed by harder copolymer sheaths of alkyl acrylates with some penetration between the layers, embedding a ply of fiberglass in the form of a waffle weave of woven roving in said resin, placing plywood against said resin on the side of the plywood opposite the acrylic sheet or film and applying vacuum to the composite unit at room temperature until a consolidated laminated sandwich is produced.
References Cited (Backward Citations)
US3276905A
Cited
US3454454A
Cited
US3509002A
Cited
US3522138A
Cited
US3869341A
Cited
US3788941A
Cited
US3720540A
Cited
FR2096943A1
Cited
US3707434A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-03 | 1981-10-03 | 1982-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-03 | 1985-10-03 | 1986-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-03 | 1989-10-03 | 1990-04-04 | $7700.00 | Window Closed / Lapsed |