US3689022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the production of case polymer sheets
Assignee: ROSTERO SA
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Filing: 1971-11-01
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Granted: 1972-09-05
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Expires: 1991-11-01
Abstract
Abstract Hollow metal plates, each formed with an interior flow passageway for circulating a fluid heat transfer medium, are used in apparatus for producing cast polymer sheets which includes a casting chamber. The plates are mode of iron or preferably of a light metal, such as aluminum and aluminum alloys, and are constructed of a frame, plates and dividers secured together by epoxy resin to form a sealed flow passageway. Means are arranged to equalize the pressure in the flow passageway and the pressure in the casting chamber of the apparatus.
Inventors
- 👤 Carlo Rossetti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:53
CPC Classifications
B; B29; B29C; B29C39/00; B29C39/22; B29C39/26; B29C39/265; B29C33/00; B29C33/0011; B29C33/02; B29C33/04; B29C33/30; B29C33/301; B29C35/00; B29C35/007; B29K; B29K2105/00; B29K2105/0002; B29K2905/00; B29K2905/02; B29K2905/08; B29K2905/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
84 words
Apparatus, as set forth in claim 1, wherein said pressure equalizing means comprises a closed vessel disposed in said heat transfer flow circuit in communication with the heat transfer medium flowing therethrough, and a pipe connected at one end to said close vessel and at its other end to said casting chamber so that it is in communication with the interior of the casting chamber for effecting the equalization of pressure between the casting chamber and the interior flow passageway within said plate members.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |