US3843285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for manufacturing a foam having a dense surface
Assignee: Mitsubishi Chemical Corp
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Filing: 1973-04-05
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Granted: 1974-10-22
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Expires: 1993-04-05
Abstract
Abstract A foam body having a relatively denser surface is molded in one step by placing a synthetic resin powder and a foamable synthetic resin bead in a metallic mold. The metallic mold is rotated and heated about its own axis while simultaneously being rotated about a second perpendicular axis. A steam producing tank is connected to the mold and after the synthetic resin powder is molten and molded on the inner surface of the metallic mold, steam is introduced to foam the synthetic resin beads.
Inventors
- 👤 H Nitta
- 👤 N Sagawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:01
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/02; B29C41/22; B29C41/04; B29C41/06; B29C44/00; B29C44/02; B29C44/04; B29C44/0423; B29C44/043; B29K; B29K2105/00; B29K2105/04; B29K2105/25; B29K2105/251
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
112 words
Apparatus for manufacturing a foamed thermoplastic body having a relatively denser surface or skin comprising; a support rotatably mounted; means to drive the support; a mold member having a mold cavity rotatably mounted on the support and adapted to receive foamable thermosplastic material; means to drive the mold member; means for producing steam fixed to and rotating with the mold member; means for heating the mold member and means for controlling the introduction of steam into the mold member while the mold member is rotating whereby the inside surface of the mold cavity is coated with some of the thermoplastic material before the steam is introduced to foam the remaining thermoplastic material.
Claim 2
Dependent Claim
112 words
Apparatus for manufacturing a foamed thermoplastic body having a relatively denser surface or skin comprising; a support rotatably mounted; means to drive the support; a mold member having a mold cavity rotatably mounted on the support and adapted to receive foamable thermosplastic material; means to drive the mold member; means for producing steam fixed to and rotating with the mold member; means for heating the mold member and means for controlling the introduction of steam into the mold member while the mold member is rotating whereby the inside surface of the mold cavity is coated with some of the thermoplastic material before the steam is introduced to foam the remaining thermoplastic material.
Claim 3
Dependent Claim
21 words
The apparatus of claim 1 where the support is mounted to rotate about a perpendicular axis to the rotating mold member.
Claim 4
Dependent Claim
27 words
The apparatus of claim 2 where the support carries the means for heating the mold member and also a heater for heating the means for producing steam.
Claim 5
Dependent Claim
30 words
The apparatus of claim 2 where the means for producing steam includes a cylindrical tank and a connecting pipe to the mold member terminating in an L-shape within the tank.
Claim 6
Dependent Claim
23 words
The apparatus of claim 4 where the end wall of the cylindrical tank contains a series of ports aligned in a single plane.
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) | 1977-10-21 | 1978-04-22 | 1978-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-21 | 1982-04-22 | 1982-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-21 | 1986-04-22 | 1986-10-22 | $7700.00 | Window Closed / Lapsed |