US2617150A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compression molding of perfluorochlorocarbon plastics
Assignee: MW Kellogg Co
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Filing: 1949-12-31
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Granted: 1952-11-11
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Expires: 1969-12-31
Abstract
No abstract record available.
Inventors
- 👤 Louis C Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/003; B29K; B29K2027/00; B29K2027/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
A METHOD FOR FORMING ARTICLES FROM A PLASTIC COMPOSED ESSENTIALLY OF POLYTRIFLUOROCHLOROETHYLENE HAVING AN N. S. T. VALUE BETWEEN ABOUT 220* C. AND ABOUT 350* C. WHICH COMPRISES PLACING SAID PLASTIC IN A DIE, MAINTAINING SAID DIE AT A TEMPERATURE BETWEEN ABOUT 415* F. AND ABOUT 625* F. UNDER COMPACTING PRESSURE BETWEEN ABOUT 500 AND ABOUT 25,000 POUNDS PER SQUARE INCH FOR A TIME SUFFICIENT TO PERMIT SAID PLASTIC TO ASSUME THE INTERNAL CONTOUR OF SAID DIE AND ATTAIN THE SIZE AND SHAPE OF THE DESIRED ARTICLE, AFTER FORMING SAID PLASTIC ARTICLE IN SAID DIE IN THE AFOREMENTIONED STEP COOLING SAID ARTICLE TO A TEMPERATURE BELOW 350* F. AND DURING SAID COOLING OPERATION RAISING THE PRESSURE ON SAID ARTICLE AT LEAST INITIALLY ABOVE SAID LAST-MENTIONED COMPACTING PRESSURE, AND THEREAFTER RECOVERING SAID FORMED ARTICLE FROM SAID DIE.
Claim 2
Independent Claim
136 words
A METHOD FOR FORMING ARTICLES FROM A PLASTIC COMPOSED ESSENTIALLY OF POLYTRIFLUOROCHLOROETHYLENE HAVING AN N. S. T. VALUE BETWEEN ABOUT 220* C. AND ABOUT 350* C. WHICH COMPRISES PLACING SAID PLASTIC IN A DIE, MAINTAINING SAID DIE AT A TEMPERATURE BETWEEN ABOUT 415* F. AND ABOUT 625* F. UNDER COMPACTING PRESSURE BETWEEN ABOUT 500 AND ABOUT 25,000 POUNDS PER SQUARE INCH FOR A TIME SUFFICIENT TO PERMIT SAID PLASTIC TO ASSUME THE INTERNAL CONTOUR OF SAID DIE AND ATTAIN THE SIZE AND SHAPE OF THE DESIRED ARTICLE, AFTER FORMING SAID PLASTIC ARTICLE IN SAID DIE IN THE AFOREMENTIONED STEP COOLING SAID ARTICLE TO A TEMPERATURE BELOW 350* F. AND DURING SAID COOLING OPERATION RAISING THE PRESSURE ON SAID ARTICLE AT LEAST INITIALLY ABOVE SAID LAST-MENTIONED COMPACTING PRESSURE, AND THEREAFTER RECOVERING SAID FORMED ARTICLE FROM SAID DIE.
References Cited (Backward Citations)
US2232475A
Cited
GB578168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |