US3704083A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion machine
Assignee: UC Industries Inc
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Filing: 1970-06-18
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Granted: 1972-11-28
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Expires: 1990-06-18
Abstract
Abstract A method or process for the extraction of a material, especially delicate or fragile materials such as plastic foams or forms, out of a vacuum chamber and removing the material from the chamber into atmospheric pressure without exerting destructive forces on the material other than the gradual application of the atmospheric pressure itself through the use of a liquid medium.
Inventors
- 👤 Arthus L Phipps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:46
CPC Classifications
B; B29; B29C; B29C67/00; B29C67/20; B29C44/00; B29C44/34; B29C44/3403; B29C44/3407; B29C44/36; B29C44/46; B29C44/50; B29C44/507; B29C48/00; B29C48/25; B29C48/355; B29C48/03; B29C48/07; B29C48/09; B29C48/10; Y; Y10; Y10S; Y10S425/00; Y10S425/06
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
214 words
A combination comprising: an extruder for extruding a plastic material that is adapted to expand into the form of a relatively rigid foam material when released from said extruder, a vacuum chamber, a barometric leg, a pool of liquid, and means to guide the said foam material from said vacuum chamber and from said barometric leg into said pool of liquid, said extruder being connected to said vacuum chamber to continuously direct extrudite into said vacuum chamber, said barometric leg having a first end and a second end, said first end of said barometric leg being connected to said vacuum chamber, said second end of said barometric leg extending into said liquid in said pool, said liquid in said pool overlying said second end of said barometric leg and forming a seal to prevent outside atmosphere from entering said barometric leg, means to evacuate said vacuum chamber and said barometric leg whereby said liquid from said pool is drawn into said leg in proportion to the pressure in said chamber, said means to guide the foam material being adapted to engage said foam material in said liquid to carry said expanded foam material from said extruder and push the material down into said pool of liquid and onto the outside of said barometric leg.
Claim 2
Dependent Claim
214 words
A combination comprising: an extruder for extruding a plastic material that is adapted to expand into the form of a relatively rigid foam material when released from said extruder, a vacuum chamber, a barometric leg, a pool of liquid, and means to guide the said foam material from said vacuum chamber and from said barometric leg into said pool of liquid, said extruder being connected to said vacuum chamber to continuously direct extrudite into said vacuum chamber, said barometric leg having a first end and a second end, said first end of said barometric leg being connected to said vacuum chamber, said second end of said barometric leg extending into said liquid in said pool, said liquid in said pool overlying said second end of said barometric leg and forming a seal to prevent outside atmosphere from entering said barometric leg, means to evacuate said vacuum chamber and said barometric leg whereby said liquid from said pool is drawn into said leg in proportion to the pressure in said chamber, said means to guide the foam material being adapted to engage said foam material in said liquid to carry said expanded foam material from said extruder and push the material down into said pool of liquid and onto the outside of said barometric leg.
Claim 3
Dependent Claim
34 words
The combination recited in claim 1 wherein said barometric leg extends from said vacuum chamber at an acute angle to the horizontal, and said means to guide said foam material comprises a belt conveyor.
Claim 4
Dependent Claim
16 words
The combination recited in claim 2 wherein said belt conveyor is disposed in said barometric leg.
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) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |