Patent US2617152A successfully refreshed from Google Patents.
US2617152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transfer molding of perfluorochlorocarbon plastic
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 12:47
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/0001; Y; Y10; Y10S; Y10S425/00; Y10S425/228
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
179 words
A METHOD FOR FORMING ARTICLES FROM A PLASTIC COMPOSED ESSENTIALLY OF POLYTRIFLUOROCHLOROETHYLENE HAVING AN N. S. T. VALUE BETWEEN ABOUT 240* C. AND ABOUT 300* C. WHICH COMPRISES HEATING SAID PLASTIC IN A LOADING WELL AT A TEMPERATURE BETWEEN ABOUT 445* F. AND ABOUT 590* F. UNDER COMPACTING PRESSURE BETWEEN ABOUT 500 AND ABOUT 1,400 POUNDS PER SQUARE INCH FOR A TIME SUFFICIENT TO PLACE SAID PLASTIC IN A SOFTENED CONDITION, DISPLACING SAID SOFTENED PLASTIC INTO A DIE, MAINTAINING SAID DIE AT A TEMPERATURE BETWEEN ABOUT 445* F. AND ABOUT 590* F. UNDER COMPACTING PRESSURE BETWEEN ABOUT 500 AND ABOUT 1,400 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, SUBSEQUENTLY COOLING SAID DIE AT AN INITIAL COMPARTING PRESSURE BETWEEN ABOUT 7,000 AND ABOUT 10,000 POUNDS PER SQUARE INCH WITH GRADUAL REDUCTION OF SAID PRESSURE UNTIL A TEMPERATURE BETWEEN ABOUT 70* F. AND ABOUT 350* F. HAS BEEN ATTAINED, AND REMOVING SAID FORMED ARTICLE FROM SAID COOLED DIE.
Claim 2
Independent Claim
179 words
A METHOD FOR FORMING ARTICLES FROM A PLASTIC COMPOSED ESSENTIALLY OF POLYTRIFLUOROCHLOROETHYLENE HAVING AN N. S. T. VALUE BETWEEN ABOUT 240* C. AND ABOUT 300* C. WHICH COMPRISES HEATING SAID PLASTIC IN A LOADING WELL AT A TEMPERATURE BETWEEN ABOUT 445* F. AND ABOUT 590* F. UNDER COMPACTING PRESSURE BETWEEN ABOUT 500 AND ABOUT 1,400 POUNDS PER SQUARE INCH FOR A TIME SUFFICIENT TO PLACE SAID PLASTIC IN A SOFTENED CONDITION, DISPLACING SAID SOFTENED PLASTIC INTO A DIE, MAINTAINING SAID DIE AT A TEMPERATURE BETWEEN ABOUT 445* F. AND ABOUT 590* F. UNDER COMPACTING PRESSURE BETWEEN ABOUT 500 AND ABOUT 1,400 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, SUBSEQUENTLY COOLING SAID DIE AT AN INITIAL COMPARTING PRESSURE BETWEEN ABOUT 7,000 AND ABOUT 10,000 POUNDS PER SQUARE INCH WITH GRADUAL REDUCTION OF SAID PRESSURE UNTIL A TEMPERATURE BETWEEN ABOUT 70* F. AND ABOUT 350* F. HAS BEEN ATTAINED, AND REMOVING SAID FORMED ARTICLE FROM SAID COOLED DIE.
References Cited (Backward Citations)
US2303339A
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 |