Patent US2087325A successfully refreshed from Google Patents.
Patent US2991508A successfully refreshed from Google Patents.
US2991508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of thermoplastic resins
Assignee: EIDP Inc
•
Filing: 1959-09-23
•
Granted: 1961-07-11
•
Expires: 1979-09-23
Abstract
No abstract record available.
Inventors
- 👤 Fields Reuben Thomas
- 👤 Wolf Carl Fritz Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:27
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/78; B29C48/80; B29C48/83; B29C48/832; B29C48/022; B29C48/86; B29C48/865; B29C48/03; B29C48/05; B29C48/07; B29C48/08; B29K; B29K2027/00; B29K2027/12; B29K2027/18; Y; Y10; Y10S; Y10S264/00; Y10S264/05
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
A PROCESS FOR PRODUCING SMOOTH-SURFACED EXTRUDED ARTICLES WHICH COMPRISES HEATING TO ITS EXTRUSION TEMPERATURE A THERMOPLASTIC RESIN SELECTED FROM THE GROUP CONSISTING OF (1) A NORMALLY SOLID ETHYLENE POLYMER HAVING AN ANNEALED DENSITY IN THE RANGE OF .95 TO .97 AND A MELT INDEX OF LESS THAN 6, AS DETERMINED BY ASTM-D-123857-T. AND (2) AN INTERPOLYMER OF TETRAFLUOROETHYLENE AND HEXAFLUOROPROPYLENE CONTAINING 6 TO 26% BY WEIGHT OF COMBINED HEXAFLUOROPROPYLENE AND HAVING A MELT VISCOSITY OF 1.5X10**4 TO 1X10**6 POISES AS MEASURED AT 380*C. UNDER A SHEAR STRESS OF 6.5 P.S.I.; FORCING SAID RESIN THROUGH A DIE SUCH THAT THE RATE OF SHEAR EXERTED ON SAID RESIN IS IN THE RANGE OF 1.0 TO 3.0 TIMES THE SUPER EXTRUSION SHEAR RATE AS HEREINABOVE DEFINED; AND RECOVERING A SMOOTHSURFACED ARTICLE FORMED THEREBY.
Claim 2
Dependent Claim
130 words
A PROCESS FOR PRODUCING SMOOTH-SURFACED EXTRUDED ARTICLES WHICH COMPRISES HEATING TO ITS EXTRUSION TEMPERATURE A THERMOPLASTIC RESIN SELECTED FROM THE GROUP CONSISTING OF (1) A NORMALLY SOLID ETHYLENE POLYMER HAVING AN ANNEALED DENSITY IN THE RANGE OF .95 TO .97 AND A MELT INDEX OF LESS THAN 6, AS DETERMINED BY ASTM-D-123857-T. AND (2) AN INTERPOLYMER OF TETRAFLUOROETHYLENE AND HEXAFLUOROPROPYLENE CONTAINING 6 TO 26% BY WEIGHT OF COMBINED HEXAFLUOROPROPYLENE AND HAVING A MELT VISCOSITY OF 1.5X10**4 TO 1X10**6 POISES AS MEASURED AT 380*C. UNDER A SHEAR STRESS OF 6.5 P.S.I.; FORCING SAID RESIN THROUGH A DIE SUCH THAT THE RATE OF SHEAR EXERTED ON SAID RESIN IS IN THE RANGE OF 1.0 TO 3.0 TIMES THE SUPER EXTRUSION SHEAR RATE AS HEREINABOVE DEFINED; AND RECOVERING A SMOOTHSURFACED ARTICLE FORMED THEREBY.
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) | 1964-07-10 | 1965-01-09 | 1965-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-10 | 1969-01-09 | 1969-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-10 | 1973-01-09 | 1973-07-11 | $7700.00 | Window Closed / Lapsed |