Patent US2853343A successfully refreshed from Google Patents.
Patent US3621076A successfully refreshed from Google Patents.
US3621076A
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Block polyheterocyclic polyimide elastomers having high thermal resistance
Assignee: WALTER F DE WINTER
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Filing: 1969-08-11
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Granted: 1971-11-16
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Expires: 1989-08-11
Abstract
Abstract Segmented aromatic imide polymers useful for spinning into elastic manmade filaments are provided. Relatively low-melting polymeric amic-acid segments resulting from combining selected ophthalic acid derived diamines with aromatic dianhydrides and relatively high-melting polymeric amic-acid segments resulting from combining isophthalic acid or terephthalic acid derived diamines with aromatic dianhydrides are joined together and heated to form a segmented elastomeric polyimide.
Inventors
- 👤 Walter F De Winter
- 👤 Jack Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:01
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/10; C08G73/1042; C08G73/1067; Y; Y10; Y10S; Y10S525/00; Y10S525/928
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
35 words
An essentially linear block polymer capable of being shaped into fibers and filaments having high-thermal stability and high elasticity even at elevated temperatures above 200* C. particularly characterized by having the following repeating structural units
Claim 2
Dependent Claim
35 words
An essentially linear block polymer capable of being shaped into fibers and filaments having high-thermal stability and high elasticity even at elevated temperatures above 200* C. particularly characterized by having the following repeating structural units
Claim 3
Dependent Claim
35 words
An essentially linear block polymer capable of being shaped into fibers and filaments having high-thermal stability and high elasticity even at elevated temperatures above 200* C. particularly characterized by having the following repeating structural units
Claim 4
Dependent Claim
34 words
An essentially linear block polymer capable of being shaped into fibers and filaments having high-thermal stability and high elasticity even at elevated temperatures above 200* C. particularly characterized by having the following repeating units
Claim 5
Dependent Claim
34 words
An essentially linear block polymer capable of being shaped into fibers and filaments having high-thermal stability and high elasticity even at elevated temperatures above 200* C. particularly characterized by having the following repeating units
Claim 6
Dependent Claim
11 words
A fiber or filament shaped from the polymer of claim 2.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |