US4266919A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ram-extrusion apparatus for non-melt fabricable polymeric resins
Assignee: EIDP Inc
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Filing: 1979-08-09
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Granted: 1981-05-12
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Expires: 1999-08-09
Abstract
Abstract In an apparatus for the ram-extrusion of non-melt fabricable polymeric resin comprising means for forcing the resin through a forming die from an extrusion chamber, the improvement wherein the ram head comprises at least about 10 percent fluoropolymer.
Inventors
- 👤 Gordon B. Dunnington
- 👤 Carl H. Manwiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:11
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/36; B29C48/475; B29C48/03; B29C48/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
93 words
In an apparatus for the ram-extrusion of non-melt fabricable polymeric resin comprising an extrusion chamber, a forming die at the end of the extrusion chamber, and a ram for forcing the resin from the extrsion chamber through the forming die, the improvement wherein the ram head in initial contact with the walls of the extrusion chamber and with the resin is consumable fluoropolymeric material which comprises at least about 10 percent fluoropolymer and wherein the forming die consecutively comprises (a) a compaction zone, (b) a back pressure zone, and (c) a relief zone.
Claim 2
Dependent Claim
93 words
In an apparatus for the ram-extrusion of non-melt fabricable polymeric resin comprising an extrusion chamber, a forming die at the end of the extrusion chamber, and a ram for forcing the resin from the extrsion chamber through the forming die, the improvement wherein the ram head in initial contact with the walls of the extrusion chamber and with the resin is consumable fluoropolymeric material which comprises at least about 10 percent fluoropolymer and wherein the forming die consecutively comprises (a) a compaction zone, (b) a back pressure zone, and (c) a relief zone.
Claim 3
Dependent Claim
14 words
An apparatus of claim 1 wherein the ram head consists of essentially of polytetrafluoroethylene.
Claim 4
Dependent Claim
27 words
An apparatus of claim 1 wherein the longitudinal dimension of the ram head in contact with the walls of the extrusion chamber is at least one-quarter inch.
Claim 5
Dependent Claim
22 words
An apparatus of claim 1 wherein the ram head consists essentially of at least about 10% polytetrafluoroethylene in a matrix of polyimide.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |