US3687592A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing thermoplastic synthetic resin foamed products
Assignee: Mitsubishi Gas Chemical Co Inc
•
Filing: 1969-11-24
•
Granted: 1972-08-29
•
Expires: 1989-11-24
Abstract
Abstract The present disclosure relates to a method and an apparatus for the continuous production of wide and thick plates or sheets of foamed products of foamable molten compositions of thermoplastic synthetic resins containing foaming agents. In carrying out the production of these foams, there are provided dies with a continuous slit and with a number of projections with predetermined intervals on both sides of the slit, in such a manner that concave and convex lips are obtained at the outlet, and the foamable resin is extruded from said dies to produce relatively thick plates or sheets of foamed material.
Inventors
- 👤 Akira Miyamoto
- 👤 Hiroyuki Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:06
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29L; B29L2007/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
The extruder in accordance with claim 1, wherein said projections of one of said rows are in direct opposition to said projections in said other row.
Claim 2
Dependent Claim
27 words
The extruder in accordance with claim 1, wherein said projections of one of said rows are laterally offset with respect to the projections in said other row.
Claim 3
Dependent Claim
16 words
The extruder in accordance with claim 1, wherein said side walls of said projections are straight.
Claim 4
Dependent Claim
16 words
The extruder in accordance with claim 1, wherein said side walls of said projections are arcuate.
Claim 5
Dependent Claim
29 words
The extruder in accordance with claim 1, wherein the width of said projections proximate said end walls thereof is smaller than the width of said projections adjacent said orifice.
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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |