US3644271A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition and process for injection molding thermoplastic material and glass fibers
Assignee: North Carolina National Bank NCNB
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Filing: 1970-03-02
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Granted: 1972-02-22
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Expires: 1990-03-02
Abstract
Abstract A composition and process for the manufacture of shaped articles by injection molding of thermoplastic material and glass fibers. The process involves the heating and masticating of from about 20 to about 40 percent weight thermoplastic material in the form of a powder having a particle size from about 30 to about 200 mesh, with from about 40 percent to about 60 percent weight of the same thermoplastic material in the form of pellets having a maximum dimension of about 1/16 inch to about 3/8 inch, together with from about 20 to about 40 percent weight of glass fibers having a maximum length of about 1/16 inch. The mixture is then injection molded to produce the article.
Inventors
- 👤 Frederick T Tulley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 09:22
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/005; B; B29; B29C; B29C45/00; B29C45/0005; C08K; C08K7/00; C08K7/02; C08K7/04; C08K7/14; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
31 words
The process of claim 1 wherein said polyvinyl chloride pellets, said polyvinyl chloride powder, and said glass fiber are combined into a uniform mixture prior to said heating and mastication step.
Claim 2
Dependent Claim
29 words
The process of claim 1 wherein said heating and masticating step is carried out by means of an injection-molding machine provided with a heated barrel containing a rotating screw.
Claim 3
Dependent Claim
112 words
A thermoplastic composition adapted for direct feeding to an injection-molding machine comprising a mixture of a. from about 20 to about 40 percent weight, based on said mixture, of polyvinyl chloride in the form of a powder having a particle size from about 30 to about 200 mesh; b. from about 40 percent to about 60 percent weight, based on said mixture, of said polyvinyl chloride in the form of pellets having a maximum dimension of from about 1/16 inch to about 3/8 inch; and c. from about 20 to about 40 percent weight, based on said mixture, glass fibers having a length of from about 1/16 inch to about 2.0 inches.
Claim 4
Dependent Claim
11 words
A shaped article produced from the thermoplastic composition of claim 4.
Claim 5
Dependent Claim
10 words
A shaped article produced by the process of claim 1.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-21 | 1975-08-23 | 1976-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-21 | 1979-08-23 | 1980-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-21 | 1983-08-23 | 1984-02-22 | $7700.00 | Window Closed / Lapsed |