US4043985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tire monofilaments
Assignee: Hoechst AG
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Filing: 1976-09-17
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Granted: 1977-08-23
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Expires: 1996-09-17
Abstract
Abstract Polyester monofilaments having very high strength and low elongation also at elevated temperature and being resistant against tire rubber are obtained from polyesters having an intrinsic viscosity of more than 0.67 and terminal carboxy groups of less than 25 milliequivalents/kg by spinning into a water bath, a first drawing in a water bath having a temperature of from 70° to 100° C in a ratio of from 1 : 4.0 to 1 : 6.0, a second drawing at a temperature being a maximum 15° C below the melting point to attain a total drawing ratio of from 1 : 6.0 to 1 : 7.5, and subsequent setting at a temperature being a maximum 15° C below the melting point without allowing a shrinkage.
Inventors
- 👤 Gunther Vock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:48
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/62
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
A monofilament of high molecular weight polyethylene terephthalate having an intrinsic viscosity of more than 0.67, a content of terminal carboxy groups of less than 25 milliequivalents/kg, a diameter of from 0.20 to 0.55 mm, a specific strength of more than 60 g/tex, an elongation at break of from 6 to 15%, an elongation at the specific load of 27 g/tex of less than 6%, and a thermoshrinkage measured at 160° C of less than 8%.
Claim 2
Dependent Claim
76 words
A monofilament of high molecular weight polyethylene terephthalate having an intrinsic viscosity of more than 0.67, a content of terminal carboxy groups of less than 25 milliequivalents/kg, a diameter of from 0.20 to 0.55 mm, a specific strength of more than 60 g/tex, an elongation at break of from 6 to 15%, an elongation at the specific load of 27 g/tex of less than 6%, and a thermoshrinkage measured at 160° C of less than 8%.
References Cited (Backward Citations)
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Cited
GB883644A
Cited
US3361859A
Cited
US3216187A
Cited
US3419060A
Cited
US3413797A
Cited
US3429354A
Cited
US3838561A
Cited
US3998921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |