Patent US4118530A successfully refreshed from Google Patents.
US4118530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pile product molded of ethylene/vinyl acetate copolymer
Assignee: Brunswick Corp
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Filing: 1978-02-10
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Granted: 1978-10-03
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Expires: 1998-02-10
Abstract
Abstract A pile product defined by a plurality of fibers which may extend from a base, the fibers being formed of a polymeric material of at least 90% by weight ethylene vinyl acetate copolymer (EVA). The pile product is formed by molding the heat softened copolymer in a mold defined by a plurality of small cross section, elongated cavities having a relatively large aspect ratio. Upon completion of the molding operation, the fibers are cooled and withdrawn from the mold cavities substantially without breakage or elongation of the fibers to provide an improved pile product. The withdrawn pile product may be further treated to effect cross linking of the polymeric material for further improved characteristics of the final product.
Inventors
- 👤 Joseph C. Benedyk
- 👤 Richard O. Stratton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:57
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/02; B29C45/17; B29C45/40; B29C45/43; Y; Y10; Y10T; Y10T428/00; Y10T428/23907; Y10T428/23957; Y10T428/23979; Y10T428/23993
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
170 words
A molded pile product comprising: (a) a base and a plurality of pile fibers extending upright from said base; (b) the fibers and base being formed from an irradiated polymer mixture comprising at least 90% by weight a copolymer of ethylene and vinyl acetate having a melt index of from 1 to 3 and not more than 1% by weight of a mold release agent; (c) the fibers having an average diameter in the range of approximately 4 to 10 mils, an average length in the range of approximately 200 to 700 mils, an aspect ratio in the range of approximately 50 to 100, and a fiber density in the range of approximately 10 to 50%; and (d) the pile product having been molded by heat and pressure in cavities corresponding to the fibers of the pile product and removed from the cavities at a temperature of 140°-170° F., the fibers exhibiting substantially no elongation or breakage in spite of removal from high aspect cavities at said elevated removal temperature.
Claim 2
Dependent Claim
170 words
A molded pile product comprising: (a) a base and a plurality of pile fibers extending upright from said base; (b) the fibers and base being formed from an irradiated polymer mixture comprising at least 90% by weight a copolymer of ethylene and vinyl acetate having a melt index of from 1 to 3 and not more than 1% by weight of a mold release agent; (c) the fibers having an average diameter in the range of approximately 4 to 10 mils, an average length in the range of approximately 200 to 700 mils, an aspect ratio in the range of approximately 50 to 100, and a fiber density in the range of approximately 10 to 50%; and (d) the pile product having been molded by heat and pressure in cavities corresponding to the fibers of the pile product and removed from the cavities at a temperature of 140°-170° F., the fibers exhibiting substantially no elongation or breakage in spite of removal from high aspect cavities at said elevated removal temperature.
Claim 3
Dependent Claim
22 words
The pile product of claim 1 where said copolymer of ethylene and vinyl acetate includes 2 to 30% by weight vinyl acetate.
Claim 4
Dependent Claim
22 words
The pile product of claim 1 where said copolymer of ethylene and vinyl acetate includes 2 to 8% by weight vinyl acetate.
Claim 5
Dependent Claim
16 words
The pile product of claim 1 where said mold release agent comprises a fatty acid agent.
Claim 6
Dependent Claim
20 words
The pile product of claim 1 where the fibers further include less than approximately 10% by weight of filler material.
Claim 7
Dependent Claim
28 words
The pile product of claim 1 where the fiber density is approximately 18 to 20% and the fibers have an average diameter of approximately 4 to 6 mils.
Claim 8
Dependent Claim
19 words
The pile product of claim 1 where the fibers include preselected pigment means providing preselected coloration of the product.
Claim 9
Dependent Claim
16 words
The pile product of claim 1 where the fibers have a sequentially molded and electron-irradiated microstructure.
Claim 10
Dependent Claim
16 words
The pile product of claim 8 where the microstructure comprises a crosslinked structure of said copolymer.
Claim 11
Dependent Claim
24 words
The pile product of claim 8 where the microstructure is preselected to prevent melting of the fibers at temperatures up to approximately 350° F.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-10-02 | 1982-04-03 | 1982-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-02 | 1986-04-03 | 1986-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-02 | 1990-04-03 | 1990-10-03 | $7700.00 | Window Closed / Lapsed |