US3962154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for producing an improved molded thermoplastic article
Assignee: Standard Oil Co
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Filing: 1974-05-31
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Granted: 1976-06-08
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Expires: 1994-05-31
Abstract
Abstract A method for producing an improved molded thermoplastic polymeric resinous article comprising: introducing a heat plastified thermoplastic polymeric resinous material into a mold in the presence of a finely divided inorganic material; cooling said heat plastified thermoplastic polymeric resinous material; removing from said mold said cooled mold shaped thermoplastic polymeric resinous material having finely divided inorganic material incorporated therein.
Inventors
- 👤 Ernst A. Egli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:45
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0066; B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/42; B29C44/421; Y; Y10; Y10S; Y10S264/00; Y10S264/05; Y10S264/14; Y10S264/17; Y10S264/83; Y10S521/00; Y10S521/908
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
71 words
A foamed thermoplastic polymeric resinous article substantially free of swirl-patterns in its surface comprising: a thermoplastic polymeric resinous material selected from the group consisting of polystyrene, polypropylene, and polyethylene having a finely divided inorganic material comprising about 30% zinc sulfide and about 70% barium sulfate intimately associated therewith in a range between about 0.001% and about 50% based upon the total weight of the thermoplastic polymeric resin and the inorganic material.
Claim 2
Dependent Claim
71 words
A foamed thermoplastic polymeric resinous article substantially free of swirl-patterns in its surface comprising: a thermoplastic polymeric resinous material selected from the group consisting of polystyrene, polypropylene, and polyethylene having a finely divided inorganic material comprising about 30% zinc sulfide and about 70% barium sulfate intimately associated therewith in a range between about 0.001% and about 50% based upon the total weight of the thermoplastic polymeric resin and the inorganic material.
Claim 3
Dependent Claim
46 words
The foamed thermoplastic polymeric resinous article substantially free of swirl-patterns in its surface of claim 1 wherein said inorganic material is present in a range of between about 1.0% and about 10% based upon the total weight of said thermoplastic polymeric resin and said inorganic material.
Claim 4
Dependent Claim
13 words
The article of claim 1 wherein the thermoplastic polymeric resinous material is polystyrene.
Claim 5
Dependent Claim
13 words
The article of claim 1 wherein the thermoplastic polymeric resinous material is polypropylene.
Claim 6
Dependent Claim
13 words
The article of claim 1 wherein the thermoplastic polymeric resinous material is polyethylene.
References Cited (Backward Citations)
US3668155A
Cited
US3657165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-06-08 | 1979-12-08 | 1980-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-06-08 | 1983-12-08 | 1984-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-06-08 | 1987-12-08 | 1988-06-08 | $7700.00 | Window Closed / Lapsed |