Patent US2904536A successfully refreshed from Google Patents.
US2904536A
Expired / Lapsed
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Polyamide containing interlinear piperazine units
Assignee: EIDP Inc
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Filing: 1955-06-29
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Granted: 1959-09-15
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Expires: 1975-06-29
Abstract
No abstract record available.
Inventors
- 👤 John E Reith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:20
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
34 words
A SYNTHETIC LINEAR FIBER-FORMING POLYMER SELECTED FROM THE GROUP CONSISTING OF POLY(HEXAMETHYLENE ADIPAMIDE) AND POLY(EPSILON CARPROAMIDE) CONTAINING IN THE POLYMER CHAIN AT LEAST ABOUT 0.2 MOL PERCENT OF A DIVALENT RADICAL OF THE FORMULA
Claim 2
Dependent Claim
34 words
A SYNTHETIC LINEAR FIBER-FORMING POLYMER SELECTED FROM THE GROUP CONSISTING OF POLY(HEXAMETHYLENE ADIPAMIDE) AND POLY(EPSILON CARPROAMIDE) CONTAINING IN THE POLYMER CHAIN AT LEAST ABOUT 0.2 MOL PERCENT OF A DIVALENT RADICAL OF THE FORMULA
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) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |