Patent US2847711A successfully refreshed from Google Patents.
US2847711A
Expired / Lapsed
US
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Method of treating polytetrafluoroethylene and to polytetrafluoroethylene so treated
Assignee: Grinnell Corp
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Filing: 1954-08-10
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Granted: 1958-08-19
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Expires: 1974-08-10
Abstract
No abstract record available.
Inventors
- 👤 Robert L Hibbard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:04
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/02; B29C43/14; B29C43/146; B29C43/003; B29C43/18; B29C43/32; B29C43/36; B29C43/40; B29C43/52; B29C70/00; B29C70/68; B29D; B29D99/00; B29D99/005; C; C08; C08L; C08L27/00; C08L27/02; C08L27/12; C08L27/18; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2105/00; B29K2105/25; B29K2105/251; B29K2705/00; B29K2995/00; B29K2995/0018; B29K2995/0026; B29L; B29L2031/00; B29L2031/755
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
THE METHOD OF TREATING A PREDETERMINED QUANTITY OF POLYTETRAFLUOROETHYLENE TO FORM AN ARTICLE INTENDED TO BE FLEXED, WHICH COMPRISES APPLYING TO SAID QUANTITY WHILE SAID QUANTITY IS WITHIN A TEMPERATURE RANGE DEFINED BY THE SECOND ORDER TRANSITION TEMPERATURE OF SAID POLYTETRAFLUOROETHYLENE AND A HIGHER MAXIMUM TEMPERATURE, SUPERATOMOSPHERIC PRESSURE AT LEAST UNTIL ALL PORTIONS OF SAID QUANTITY WHICH ARE INTENDED TO BE FLEXED BECOME SUBSTANTIALLY TRANSPARENT BY OVSERVATION WHILE SAID QUANTITY IS AT A TEMPERATURE OF AT LEAST THE SECOND ORDER TRANSISTION TEMPERATURE BY FOR AN INSUFFICIENT TIME TO PRODUCE SUBSTANTIAL DECOMPOSITION OF SAID POLYTETRAFLUOROETHYLENE, AND COOLING SAID QUANTITY THROUGH SAID TRANSITION TEMPERATURE, SAID MAXIMUM TEMPERATURE BEING LESS THAN THAT TEMPERATURE WHICH PRODUCES SUBSTANTIAL DECOMPOSITION OF SAID POLYTETRAFLUOROETHYLENE DURING THE PERIOD THAT SAID QUANTITY IS WITHIN SAID TEMPERATURE RANGE.
Claim 2
Independent Claim
128 words
THE METHOD OF TREATING A PREDETERMINED QUANTITY OF POLYTETRAFLUOROETHYLENE TO FORM AN ARTICLE INTENDED TO BE FLEXED, WHICH COMPRISES APPLYING TO SAID QUANTITY WHILE SAID QUANTITY IS WITHIN A TEMPERATURE RANGE DEFINED BY THE SECOND ORDER TRANSITION TEMPERATURE OF SAID POLYTETRAFLUOROETHYLENE AND A HIGHER MAXIMUM TEMPERATURE, SUPERATOMOSPHERIC PRESSURE AT LEAST UNTIL ALL PORTIONS OF SAID QUANTITY WHICH ARE INTENDED TO BE FLEXED BECOME SUBSTANTIALLY TRANSPARENT BY OVSERVATION WHILE SAID QUANTITY IS AT A TEMPERATURE OF AT LEAST THE SECOND ORDER TRANSISTION TEMPERATURE BY FOR AN INSUFFICIENT TIME TO PRODUCE SUBSTANTIAL DECOMPOSITION OF SAID POLYTETRAFLUOROETHYLENE, AND COOLING SAID QUANTITY THROUGH SAID TRANSITION TEMPERATURE, SAID MAXIMUM TEMPERATURE BEING LESS THAN THAT TEMPERATURE WHICH PRODUCES SUBSTANTIAL DECOMPOSITION OF SAID POLYTETRAFLUOROETHYLENE DURING THE PERIOD THAT SAID QUANTITY IS WITHIN SAID TEMPERATURE RANGE.
References Cited (Backward Citations)
US2456262A
Cited
US2602962A
Cited
US2559750A
Cited
US2617149A
Cited
US2710991A
Cited
US2728698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |