US4014966A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for injection molding a composite foamed body having a foamed core and a continuous surface layer
Assignee: Individual
•
Filing: 1974-11-05
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Granted: 1977-03-29
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Expires: 1994-11-05
Abstract
Abstract A method of injection molding a body of synthetic resin with a smooth surface and a porous core, which comprises the steps of injecting into a mold first outer synthetic resin forming a smooth surface of the body and thereafter synthetic-resin core material containing an expanding or foaming agent. Only part of the outer material is first injected, the remainder being injected simultaneously with the synthetic-resin core material.
Inventors
- 👤 Robert Hanning
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:58
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/16; B29C45/1642; B29C44/00; B29C44/02; B29C44/04; B29C44/0492; B29C2045/1651; B29C2045/1653; Y; Y10; Y10S; Y10S264/00; Y10S264/83; Y10T; Y10T428/00; Y10T428/23; Y10T428/233; Y10T428/249921; Y10T428/249953; Y10T428/249987; Y10T428/249991; Y10T428/31504; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
182 words
A method of making a composite synthetic resin body having a foamed core and a continuous surface layer, said method comprising the steps of: a. injecting into a mold cavity of given volume an initial quantity of a melt of a first synthetic thermoplastic resin material adapted to form surface portions of said body through a passageway surrounding a tube penetrating into said mold cavity for a distance at least equal to the thickness of said layer, said passageway terminating short of the end of said tube penetrating into said mold; and b. thereafter injecting into said mold cavity through said tube a quantity of a melt of a second synthetic thermoplastic resin material containing an expanding agent to spread said first material along the walls of said cavity and concurrently therewith continuing to inject said first material through said passageway in a sheath around said melt of said second material at a rate such that the spreading of said the melt of first material by said second material is incapable of interrupting the continuity of the layer of said first material.
Claim 2
Independent Claim
182 words
A method of making a composite synthetic resin body having a foamed core and a continuous surface layer, said method comprising the steps of: a. injecting into a mold cavity of given volume an initial quantity of a melt of a first synthetic thermoplastic resin material adapted to form surface portions of said body through a passageway surrounding a tube penetrating into said mold cavity for a distance at least equal to the thickness of said layer, said passageway terminating short of the end of said tube penetrating into said mold; and b. thereafter injecting into said mold cavity through said tube a quantity of a melt of a second synthetic thermoplastic resin material containing an expanding agent to spread said first material along the walls of said cavity and concurrently therewith continuing to inject said first material through said passageway in a sheath around said melt of said second material at a rate such that the spreading of said the melt of first material by said second material is incapable of interrupting the continuity of the layer of said first material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-28 | 1980-09-27 | 1981-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-28 | 1984-09-27 | 1985-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-28 | 1988-09-27 | 1989-03-29 | $7700.00 | Window Closed / Lapsed |