Patent US3744262A successfully refreshed from Google Patents.
US3744262A
Expired / Lapsed
US
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Method for cooling thermoformed plastic parts
Assignee: Individual
•
Filing: 1971-06-30
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Granted: 1973-07-10
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Expires: 1991-06-30
Abstract
Abstract Thermoformed plastic parts are cooled before removal from the mold by enclosing an area adjacent to the part and introducing liquid carbon dioxide to the confined area through metering orifices.
Inventors
- 👤 R Bose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:50
CPC Classifications
F; F25; F25D; F25D3/00; F25D3/10; B; B29; B29C; B29C51/00; B29C51/26; B29C51/42; B29C51/427
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
71 words
A method of cooling a thermoformed plastic part while said part is still in position against the mold surface where it was formed, comprising the steps of confining the surface of said plastic part remote from said mold by means of a cover to provide an enclosed space partially defined by said surface, and spraying liquid carbon dioxide into said space in a direction toward said cover away from said part.
Claim 2
Independent Claim
71 words
A method of cooling a thermoformed plastic part while said part is still in position against the mold surface where it was formed, comprising the steps of confining the surface of said plastic part remote from said mold by means of a cover to provide an enclosed space partially defined by said surface, and spraying liquid carbon dioxide into said space in a direction toward said cover away from said part.
Claim 3
Dependent Claim
51 words
A method according to claim 1 wherein said spraying step is carried out by spraying said liquid carbon dioxide from a plurality of locations to cause the carbon dioxide sprays from said locations to intercept one another within said space and break up the particles of carbon dioxide in said sprays.
Claim 4
Dependent Claim
21 words
A method according to claim 1 wherein said space is at approximately atmospheric pressure during the introduction of carbon dioxide therein.
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |