US3090997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of continuous treatment of as-spun birefringent polyamide filaments
Assignee: EIDP Inc
•
Filing: 1958-11-26
•
Granted: 1963-05-28
•
Expires: 1978-11-26
Abstract
No abstract record available.
Inventors
- 👤 Au Tin-Yam
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:37
CPC Classifications
D; D01; D01F; D01F6/00; D01F6/58; D01F6/60; D01D; D01D10/00; D01D10/02; D01D5/00; D01D5/12; D01D5/16; Y; Y10; Y10S; Y10S57/00; Y10S57/902; Y10S8/00; Y10S8/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
62 words
AN IMPROVED METHOD OF CONTINUOUS TREATMENT OF AS-SPUN BIREFRINGENT POLYAMIDE FILAMENTS TO DEVELOP THERE IN AS DESIRED LEVELS OF TENACITY, BREAK ELONGATION, RESISTANCE TO FATIGUE COMBINED WITH LOW RELAXED COLD GROWTH, SAID METHOD COMPRISING A FIRST STEP OF DRAWING AS-SPUN POLYAMIDE FILAMENTS, HAVING A BIREFRINGENCE B, SO THAT THE RATIO R1 OF DRAWN LENGTH TO UNDRAWN LENGTH IS DETERMINED BY THE EQUATION
Claim 2
Dependent Claim
62 words
AN IMPROVED METHOD OF CONTINUOUS TREATMENT OF AS-SPUN BIREFRINGENT POLYAMIDE FILAMENTS TO DEVELOP THERE IN AS DESIRED LEVELS OF TENACITY, BREAK ELONGATION, RESISTANCE TO FATIGUE COMBINED WITH LOW RELAXED COLD GROWTH, SAID METHOD COMPRISING A FIRST STEP OF DRAWING AS-SPUN POLYAMIDE FILAMENTS, HAVING A BIREFRINGENCE B, SO THAT THE RATIO R1 OF DRAWN LENGTH TO UNDRAWN LENGTH IS DETERMINED BY THE EQUATION
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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) | 1966-05-27 | 1966-11-26 | 1967-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-05-27 | 1970-11-26 | 1971-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-05-27 | 1974-11-26 | 1975-05-28 | $7700.00 | Window Closed / Lapsed |