US2854699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compression molding of copolymers of trifluorochloroethylene and vinylidene fluoride
Assignee: 3M Co
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Filing: 1955-04-19
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Granted: 1958-10-07
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Expires: 1975-04-19
Abstract
No abstract record available.
Inventors
- 👤 Lester E Robb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:19
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/003; B29K; B29K2027/00; B29K2027/12; B29K2027/16; B29K2105/00; B29K2105/25; B29K2105/251
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A METHOD FOR FORMING ARTICLES FROM A MATERIAL COMPRISING AN ELASTOMERIC COPOLYMER OF TRIFLUOROCHLOROETHYLENE AND VINYLIDENE FLUORIDE, SAID COPOLYMER CONTAINING BETWEEN ABOUT 20 AND ABOUT 69 MOLE PERCENT TRIFLUOROCHLOROETHYLENE AND CORRESPONDINGLY BETWEEN ABOUT 80 AND ABOUT 31 MOLE PERCENT VNYLIDENE FLUORIDE, SAID ELASTOMERIC COPOLYMER UNDERGOING A TRANSITION FROM AN ELASTOMERIC STATE TO A NON-ELASTIC POWDERY STATE AT ABOUT 170-190*F., SAID PROCESS COMPRISING PLACING SAID MATERIAL IN A DIE, MAINTAINING SAID DIE AT A TEMPERATURE RANGE ABOVE THE TRANSITION TEMPERATURE AND BELOW THE TEMPERATURE OF SUBSTANTIAL DDCOMPOSITION OF SAID COPOLYMER UNDER COMPACTING PRESSURE BETWEEN ABOUT 200 AND ABOUT 3,000 POUNDS PER SQUARE INCH FOR A TIME SUFFICIENT TO PERMIT SAID MATERIAL TO ASSUME THE INTERNAL CONTOUR OF SAID DIE AND ATTAIN THE SIZE AND SHAPE OF THE DESIRED ARTICLE, AND THEREAFTER REMOVING SAID FORMED ARTICLE FROM SAID DIE.
Claim 2
Independent Claim
137 words
A METHOD FOR FORMING ARTICLES FROM A MATERIAL COMPRISING AN ELASTOMERIC COPOLYMER OF TRIFLUOROCHLOROETHYLENE AND VINYLIDENE FLUORIDE, SAID COPOLYMER CONTAINING BETWEEN ABOUT 20 AND ABOUT 69 MOLE PERCENT TRIFLUOROCHLOROETHYLENE AND CORRESPONDINGLY BETWEEN ABOUT 80 AND ABOUT 31 MOLE PERCENT VNYLIDENE FLUORIDE, SAID ELASTOMERIC COPOLYMER UNDERGOING A TRANSITION FROM AN ELASTOMERIC STATE TO A NON-ELASTIC POWDERY STATE AT ABOUT 170-190*F., SAID PROCESS COMPRISING PLACING SAID MATERIAL IN A DIE, MAINTAINING SAID DIE AT A TEMPERATURE RANGE ABOVE THE TRANSITION TEMPERATURE AND BELOW THE TEMPERATURE OF SUBSTANTIAL DDCOMPOSITION OF SAID COPOLYMER UNDER COMPACTING PRESSURE BETWEEN ABOUT 200 AND ABOUT 3,000 POUNDS PER SQUARE INCH FOR A TIME SUFFICIENT TO PERMIT SAID MATERIAL TO ASSUME THE INTERNAL CONTOUR OF SAID DIE AND ATTAIN THE SIZE AND SHAPE OF THE DESIRED ARTICLE, AND THEREAFTER REMOVING SAID FORMED ARTICLE FROM SAID DIE.
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) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |