US4435350A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the orientation of thermoplastic polyether ether ketone films
Assignee: Sumitomo Chemical Co Ltd
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Filing: 1982-02-18
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Granted: 1984-03-06
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Expires: 2002-02-18
Abstract
Abstract A method for the orientation of a thermoplastic polyether ether ketone film or sheet is described, which comprises rolling the thermoplastic polyether ether ketone film or sheet containing therein a repeating unit represented by the formula: <IMAGE> singly or in combination with one or more different repeating units at a linear pressure of at least 100 kg/cm by the use of at least one pair of pressure rolls maintained within a temperature range of from 80 DEG C. to 320 DEG C. while applying a backward tension of at least 80 kg/cm2.
Inventors
- 👤 Nobuo Fukushima
- 👤 Teruo Saitou
- 👤 Haruo Hayashida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:24
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C55/00; B29C55/005; B29C55/02; B29C55/18; C08L; C08L71/00; B29K; B29K2071/00; B29K2086/00; C08J2371/00; C08J2371/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
A method for the orientation of a film or sheet consisting essentially of a crystalline thermoplastic polyether ether ketone containing therein a repeating unit represented by the formula: ##STR5## singly or in combination with one or more different repeating units, which comprises rolling the film or sheet of crystalline thermoplastic polyether ether ketone at a linear pressure of at least 100 kg/cm by the use of at least one pair of pressure rolls maintained within a temperature range of from 80° C. to 320° C. while applying a backward tension of at least 80 kg/cm 2 .
Claim 2
Independent Claim
97 words
A method for the orientation of a film or sheet consisting essentially of a crystalline thermoplastic polyether ether ketone containing therein a repeating unit represented by the formula: ##STR5## singly or in combination with one or more different repeating units, which comprises rolling the film or sheet of crystalline thermoplastic polyether ether ketone at a linear pressure of at least 100 kg/cm by the use of at least one pair of pressure rolls maintained within a temperature range of from 80° C. to 320° C. while applying a backward tension of at least 80 kg/cm 2 .
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) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |