US3299009A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemically crimped nylon fibers
Assignee: Individual
•
Filing: 1963-04-18
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Granted: 1967-01-17
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Expires: 1983-04-18
Abstract
No abstract record available.
Inventors
- 👤 Stephen D Bruck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:24
CPC Classifications
D; D02; D02G; D02G1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A CRIMPED POLYCARBONAMIDE FIBER MADE BY: (A) REACTING AN ORIENTED POLYCARBONAMIDE FIBER HAVING AT LEAST 20% BY VOLUME CRYSTALLITES THEREIN WITH THE HEMIACETAL OF FORMALDEHYDE AND METHANOL, (B) THEREAFTER REACTING SAID FIBER WITH A MEMBER OF THE GROUP CONSISTING OF THIOUREA AND THIOACETAMIDE IN THE PRESENCE OF METHANOL AND A MINERAL ACID, (C) THEREAFTER REACTING SAID FIBER WITH A SOLUTION OF AN ALKALI METAL HYDROXIDE AND METHANOL, AND SIMULTANEOUSLY BUBBLING AIR THROUGH SAID SOLUTIN, AND (D) WASHING AND DRYING SAID FIBER.
Claim 2
Dependent Claim
81 words
A CRIMPED POLYCARBONAMIDE FIBER MADE BY: (A) REACTING AN ORIENTED POLYCARBONAMIDE FIBER HAVING AT LEAST 20% BY VOLUME CRYSTALLITES THEREIN WITH THE HEMIACETAL OF FORMALDEHYDE AND METHANOL, (B) THEREAFTER REACTING SAID FIBER WITH A MEMBER OF THE GROUP CONSISTING OF THIOUREA AND THIOACETAMIDE IN THE PRESENCE OF METHANOL AND A MINERAL ACID, (C) THEREAFTER REACTING SAID FIBER WITH A SOLUTION OF AN ALKALI METAL HYDROXIDE AND METHANOL, AND SIMULTANEOUSLY BUBBLING AIR THROUGH SAID SOLUTIN, AND (D) WASHING AND DRYING SAID FIBER.
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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |