US3626053A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of molding thermoplastic sheet material
Assignee: Azdel Inc
•
Filing: 1968-03-19
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Granted: 1971-12-07
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Expires: 1988-03-19
Abstract
Abstract This invention relates to a method of molding thermoplastic sheet material by heating the thermoplastic sheet material to its softened state, forming the heat softened material into a shaped article and then allowing the shaped article to undergo a shrinkage with respect to its thickness while maintaining the length and width of the shaped article substantially constant.
Inventors
- 👤 Peter H Hofer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:46
CPC Classifications
B; B29; B29C; B29C51/00; B29C51/002; B29C51/08; B29C51/082; B29K; B29K2105/00; B29K2105/06; B29K2105/08; B29K2105/0854
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
14 words
A method as defined in claim 1 wherein the thermoplastic sheet contains glass fibers.
Claim 2
Dependent Claim
22 words
A method as defined in claim 1 wherein the thermoplastic sheet contains about 10 to about 80 percent by weight glass fibers.
Claim 3
Dependent Claim
22 words
A method as defined in claim 1 wherein the thermoplastic sheet contains about 40 to about 60 percent by weight glass fibers.
Claim 4
Dependent Claim
19 words
A method as defined in claim 2 wherein the thermoplastic sheet material is a copolymer of styrene and acrylonitrile.
Claim 5
Dependent Claim
14 words
A method as defined in claim 2 wherein the thermoplastic sheet material is polypropylene.
Claim 6
Dependent Claim
21 words
A method as defined in claim 2 wherein the thermoplastic sheet material is a copolymer of vinyl chloride and vinyl acetate.
Claim 7
Dependent Claim
36 words
A method as defined in claim 1 wherein at least one additional thermoplastic member is placed in contact with the thermoplastic sheet material prior to the moldIng of the thermoplastic sheet material into a shaped article.
References Cited (Backward Citations)
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US2532501A
Cited
US2595970A
Cited
US2680882A
Cited
US2781552A
Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-06 | 1975-06-07 | 1975-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-06 | 1979-06-07 | 1979-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-06 | 1983-06-07 | 1983-12-07 | $7700.00 | Window Closed / Lapsed |