US3666849A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cooling thermoformed articles
Assignee: Phillips Petroleum Co
•
Filing: 1970-04-03
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Granted: 1972-05-30
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Expires: 1990-04-03
Abstract
Abstract Cooling fluid, such as liquid carbon dioxide, is introduced into thermoformed articles to aid in cooling. A pressure switch in the blowing fluid conduit introduces the cooling fluid when the pressure of the blowing fluid reaches a first value and stops flow of the cooling fluid when a second higher pressure is reached.
Inventors
- 👤 George E Williams
- 👤 Edward C Held Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:35
CPC Classifications
B; B29; B29C; B29C49/00; B29C49/42; B29C49/64; B29C49/66; B29C35/00; B29C35/16; B29C2035/1616; B29C2035/1625; B29C2035/165
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
29 words
The process of claim 1 wherein the first fluid is air, and the cooling fluid is liquid carbon dioxide which is permitted to expand and vaporize in said conduit.
References Cited (Backward Citations)
US3488801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |