US3193442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-woven products composed of nonuniformly drawn staple fibers
Assignee: Imperial Chemical Industries Ltd
•
Filing: 1961-12-26
•
Granted: 1965-07-06
•
Expires: 1981-12-26
Abstract
No abstract record available.
Inventors
- 👤 Schulz Francis
- 👤 Glen William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 03:04
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/04; D04H1/06; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2904
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
75 words
A FIBROUS PRODUCT OF SYNTHENTIC ORGANIC POLYMER FIBRES HAVING A STAPLE LENGHT OF ONE TO SIX INCHES, PREDOMINANTLY LYING IN A PARALLELISED CONDITION AND A MINOR PROPORTION LYING IN A NON-PARALLEL POSITION THE NON-PARALLEL FIBRES THEREBY INTERLACING A PROPORTION OF THE PARALLELISED FIBRES TO FORM A SELF-SUPPORTING CONSOLIDIATABLE STRUCTURE, A MAJOR PROPORTION OF THE FIBRES HAVING NONUNIFORMLY DRAWN PORTIONS ALONG THE LENGTH OF EACH FIBRE, THE BIREFRINGENCE OF SAID FIBRE VARYING BY AT LEAST 25X10**-3.
Claim 2
Dependent Claim
75 words
A FIBROUS PRODUCT OF SYNTHENTIC ORGANIC POLYMER FIBRES HAVING A STAPLE LENGHT OF ONE TO SIX INCHES, PREDOMINANTLY LYING IN A PARALLELISED CONDITION AND A MINOR PROPORTION LYING IN A NON-PARALLEL POSITION THE NON-PARALLEL FIBRES THEREBY INTERLACING A PROPORTION OF THE PARALLELISED FIBRES TO FORM A SELF-SUPPORTING CONSOLIDIATABLE STRUCTURE, A MAJOR PROPORTION OF THE FIBRES HAVING NONUNIFORMLY DRAWN PORTIONS ALONG THE LENGTH OF EACH FIBRE, THE BIREFRINGENCE OF SAID FIBRE VARYING BY AT LEAST 25X10**-3.
Claim 3
Dependent Claim
47 words
A FIBROUS PRODUCT ACCORDING TO CLAIM 1 IN WHICH AT LEAST A SUBSTANTIAL PROPORTION OF THE FIBRES CONSIST OF STEREO-SPECIFIC POLYPROPYLENE FIBRES HAVING A BIREFRINGENCE BETWEEN 0.0015 AND 0.03 AND CONTAINING PORTIONS IN WHICH THE DIFFERENCE IN BIREFRINGENCE IS ABOUT 25 X 10**-3 BETWEEN THE STATED VALUES.
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) | 1968-07-05 | 1969-01-04 | 1969-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-05 | 1973-01-04 | 1973-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-05 | 1977-01-04 | 1977-07-06 | $7700.00 | Window Closed / Lapsed |