Patent US2938236A successfully refreshed from Google Patents.
US2938236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calendering of copolymers of trifluorochloroethylene and vinylidene
Assignee: 3M Co
•
Filing: 1958-07-31
•
Granted: 1960-05-31
•
Expires: 1978-07-31
Abstract
No abstract record available.
Inventors
- 👤 Lester E Robb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:10
CPC Classifications
B; B29; B29B; B29B7/00; B29B7/30; B29B7/34; B29B7/52; B29B7/56; B29B7/568; B29B7/002; B29B7/007; B29C; B29C43/00; B29C43/22; B29C43/24; B29K; B29K2019/00; B29K2027/00; B29K2027/12; B29K2027/16; B29K2105/00; B29K2105/0085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A METHOD FOR CALENDERING A MATERIAL COMPRISING AN ELASTOMERIC COPOLYMER OF TRIFLUOROCHLOROETHYLENE AND VINYLIDENE FLUORIDE WHICH COPOLYMER UNDERGOES A TRANSITION FROM AN ELASTOMERIC STATE TO A NON-ELASTIC POWDERY STATE AT ABOUT 170-190*F., SAID METHOD COMPRISING: INTRODUCING SAID MATERIAL BETWEEN A SET OF CALENDERING ROLLS, PASSING SAID MATERIAL THROUGH SAID CALENDERING ROLLS WHILE MAINTAINING A TEMPERATURE THEREON AT LEAST ABOUT 130*F. BUT BELOW THE TRANSITION TEMPERATURE OF SAID COPOLYMER, AND WITHDRAWING THE THUS-FORMED CALENDERED MATERIAL FROM SAID CALENDERING ROLLS.
Claim 2
Independent Claim
78 words
A METHOD FOR CALENDERING A MATERIAL COMPRISING AN ELASTOMERIC COPOLYMER OF TRIFLUOROCHLOROETHYLENE AND VINYLIDENE FLUORIDE WHICH COPOLYMER UNDERGOES A TRANSITION FROM AN ELASTOMERIC STATE TO A NON-ELASTIC POWDERY STATE AT ABOUT 170-190*F., SAID METHOD COMPRISING: INTRODUCING SAID MATERIAL BETWEEN A SET OF CALENDERING ROLLS, PASSING SAID MATERIAL THROUGH SAID CALENDERING ROLLS WHILE MAINTAINING A TEMPERATURE THEREON AT LEAST ABOUT 130*F. BUT BELOW THE TRANSITION TEMPERATURE OF SAID COPOLYMER, AND WITHDRAWING THE THUS-FORMED CALENDERED MATERIAL FROM SAID CALENDERING ROLLS.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-31 | 1963-11-30 | 1964-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-31 | 1967-11-30 | 1968-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-31 | 1971-11-30 | 1972-05-31 | $7700.00 | Window Closed / Lapsed |