Patent US3396071A successfully refreshed from Google Patents.
US3396071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-woven polypropylene fabrics
Assignee: Imperial Chemical Industries Ltd
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Filing: 1964-03-02
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Granted: 1968-08-06
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Expires: 1984-03-02
Abstract
No abstract record available.
Inventors
- 👤 Peter John Couzens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:51
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/54; D04H1/542; D04H1/544; Y; Y10; Y10T; Y10T442/00; Y10T442/60; Y10T442/681; Y10T442/69; Y10T442/692; Y10T442/697
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
NON-WOVEN FABRICS CONSISTING WHOLLY OF CONSOLIDATED, BLENDED STEREOREGULAR POLYPROPYLENE FIBERS COMPRISING AT LEAST 10% BY WEIGHT OF UNDRAWN FIBRES HAVING A BRIEFRINGENCE OF LESS THAN 20X10**-3 AND AN EXTENSION AT BREAK OF MORE THAN 100% AND BEING SELECTED FROM THE GROUP CONSISTING OF MELT SPUN STEROREGULAR POLYPROPYLENE FIBRES AND SOLUTIONK SPUN STEROREGULAR POLYPROPYLENE FIBRES AND UP TO 90% BY WEIGHT OF DRAWN, SUBSTANTIALLY FULY ORIENTED STEREOREGULAR POLYPROPYLENE FIBRES HAVING A BRIEFRINGENCE ABOVE 25X10**-3, AN EXTENSION AT BREAK OF LESS THAN 70% AND A FREE SHRINKAGE AT 140*C. OF AT LEAST 10%, SAID UNDRAWN AND DRAWN FIBRES HAVING THE SAME MOLECULAR STRUCTURE AND AT LEAST A PROPORTION OF THE FIBRES HAVING BEEN BONDED TOGETHER AT THE FIBRE CROSS-OVER POINTS AS A RESULT OF THE SOFTENING OF THE FIBRES THEREAT.
Claim 2
Dependent Claim
128 words
NON-WOVEN FABRICS CONSISTING WHOLLY OF CONSOLIDATED, BLENDED STEREOREGULAR POLYPROPYLENE FIBERS COMPRISING AT LEAST 10% BY WEIGHT OF UNDRAWN FIBRES HAVING A BRIEFRINGENCE OF LESS THAN 20X10**-3 AND AN EXTENSION AT BREAK OF MORE THAN 100% AND BEING SELECTED FROM THE GROUP CONSISTING OF MELT SPUN STEROREGULAR POLYPROPYLENE FIBRES AND SOLUTIONK SPUN STEROREGULAR POLYPROPYLENE FIBRES AND UP TO 90% BY WEIGHT OF DRAWN, SUBSTANTIALLY FULY ORIENTED STEREOREGULAR POLYPROPYLENE FIBRES HAVING A BRIEFRINGENCE ABOVE 25X10**-3, AN EXTENSION AT BREAK OF LESS THAN 70% AND A FREE SHRINKAGE AT 140*C. OF AT LEAST 10%, SAID UNDRAWN AND DRAWN FIBRES HAVING THE SAME MOLECULAR STRUCTURE AND AT LEAST A PROPORTION OF THE FIBRES HAVING BEEN BONDED TOGETHER AT THE FIBRE CROSS-OVER POINTS AS A RESULT OF THE SOFTENING OF THE FIBRES THEREAT.
References Cited (Backward Citations)
US3112300A
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GB808287A
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GB844760A
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US3117055A
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US3186893A
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US3229008A
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US3193442A
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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) | 1971-08-06 | 1972-02-05 | 1972-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-06 | 1976-02-05 | 1976-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-06 | 1980-02-05 | 1980-08-06 | $7700.00 | Window Closed / Lapsed |