Patent US3540870A successfully refreshed from Google Patents.
US4529641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermoformable laminate structure
Assignee: Monsanto Co
•
Filing: 1984-09-07
•
Granted: 1985-07-16
•
Expires: 2004-09-07
Abstract
Abstract A twin-sheet thermoformable laminate structure is provided which has two layers of foamed thermoplastic material. A coating of a fabric impregnated with an acrylic resin having a softening temperature greater than 75° C. is applied to at least the outer surface of each layer of thermoplastic material.
Inventors
- 👤 James S. Holtrop
- 👤 Richard P. Maurer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:22
CPC Classifications
B; B32; B32B; B32B5/00; B32B5/22; B32B5/32; B32B27/00; B32B27/12; G; G10; G10K; G10K11/00; G10K11/16; G10K11/162; G10K11/168; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T428/249921; Y10T428/249953; Y10T428/249981; Y10T428/249987; Y10T428/249991; Y10T428/249992; Y10T442/00; Y10T442/60; Y10T442/647; Y10T442/649
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
70 words
A moisture resistant, moldable, thermoformable laminate structure comprising: (a) at least two layers of foamed thermoplastic material, said layers having inner and outer surfaces, said layers being bonded together on at least a portion of said inner surfaces; and (b) a coating bonded to at least said outer surfaces; said coating being a resin impregnated fabric; said resin being an acrylic resin having a softening temperature greater than 75° C.
Claim 2
Dependent Claim
70 words
A moisture resistant, moldable, thermoformable laminate structure comprising: (a) at least two layers of foamed thermoplastic material, said layers having inner and outer surfaces, said layers being bonded together on at least a portion of said inner surfaces; and (b) a coating bonded to at least said outer surfaces; said coating being a resin impregnated fabric; said resin being an acrylic resin having a softening temperature greater than 75° C.
Claim 3
Dependent Claim
29 words
The laminate structure of claim 1 wherein the layers of foamed thermoplastic material are selected from a group consisting of foamed polystyrene, foamed styrene-maleic anhydride polymer and foamed polyethylene.
Claim 4
Dependent Claim
17 words
The laminate structure of claim 1 wherein the layers of foamed thermoplastic material are a foamed polystyrene.
Claim 5
Dependent Claim
13 words
The laminate structure of claim 1 wherein said fabric is a non-woven material.
Claim 6
Dependent Claim
14 words
The laminate structure of claim 1 wherein said fabric is a non-woven, spunbonded fabric.
Claim 7
Dependent Claim
14 words
The laminate structure of claim 1 wherein said acrylic resin is styrene-methacrylic acid copolymer.
Claim 8
Dependent Claim
20 words
The laminate structure of claim 1 wherein a portion of said layers of foamed thermoplastic material are adhesively bonded together.
References Cited (Backward Citations)
FR1362035A
Cited
US3303086A
Cited
US3355535A
Cited
US3531367A
Cited
US3541620A
Cited
US3565746A
Cited
US3654063A
Cited
US3817818A
Cited
US3787259A
Cited
US3833259A
Cited
US3948436A
Cited
US4065596A
Cited
US4147828A
Cited
US4167824A
Cited
DE2906259A1
Cited
US4388363A
Cited
US4476183A
Cited
US4489126A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |