Patent US3800022A successfully refreshed from Google Patents.
US3800022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of new oriented film and tapes
Assignee: Imperial Chemical Industries Ltd
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Filing: 1973-01-17
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Granted: 1974-03-26
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Expires: 1993-01-17
Abstract
Abstract Processes for the production of uniaxially drawn films and tapes of polyethylene-1:2-diphenoxy-4:4''-dicarboxylate in which the film or tape is first crystallised by heating to 80*-220*C and then uniaxially oriented.
Inventors
- 👤 R Buteux
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:53
CPC Classifications
B; B29; B29C; B29C55/00; B29C55/005; B29C55/02; B29C55/04; B29C55/06; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; H01B3/421; H01B3/422; H01B3/423; B29K; B29K2067/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
20 words
A process as claimed in claim 1 wherein crystallisation is effected at a temperature within the range 150* to 220*C.
Claim 2
Dependent Claim
42 words
A process as claimed in claim 1 wherein the layer of poly-1: 2-diphenoxyethane-4:4''-dicarboxylate is produced by melt extruding poly-1:2-diphenoxyethane-4:4-dicarboxylate from a slot die and quenching the extrudate to form said undrawn amorphous film or tape which is then heated to effect crystallisation.
Claim 3
Dependent Claim
15 words
A process as claimed in claim 1 wherein the drawing temperature is at least 80*C.
Claim 4
Dependent Claim
21 words
A process as claimed in claim 1 wherein the undrawn layer is drawn to at least 4 times its original length.
Claim 5
Dependent Claim
29 words
A process as claimed in claim 1 in which the poly-1:2-diphenoxyethane-4:4''-dicarboxylate has a relative viscosity, as measured on a 1 percent solution in o-chlorophenol of between 1.7 and 2.5.
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) | 1977-03-25 | 1977-09-24 | 1978-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-25 | 1981-09-24 | 1982-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-25 | 1985-09-24 | 1986-03-26 | $7700.00 | Window Closed / Lapsed |