US3597400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic linear transparent polyamides
Assignee: Toray Industries Inc
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Filing: 1969-06-30
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Granted: 1971-08-03
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Expires: 1989-06-30
Abstract
Abstract SYNTHETIC LINEAR POLYAMIDE CONSISTING ESSENTIALLY OF A POLYCONDENSATE FROM SUBSTANTIALLY EQUIMOLAR AMOUNTS OF A DIAMINE COMPONENT CONSISTING OF BIS(4-AMINOCYCLOHEXYL) METHANE AND HEXAMETHYLENE DIAMINE, AND A DICARBOXYLIC COMPONENT CONSISTING OF TEREPHTHALIC ACID AND ISOPHTHALIC ACID, THE COMPOSITION RATIO OF THE DIAMINE COMPONENT AND THE DICARBOXYLIC ACID COMPONENT BEING WITHIN A SPECIFIC RANGE AND SAID POLYAMIDE HAVING A RELATIVE VISCOSITY NREL., MEASURED IN A SOLUTION OF 1 G. OF THE POLYAMIDE IN 100 CC. OF 98% CONCENTRATED SULFURIC ACID AT 25*C., OF AT LEAST 1.9, AND PROCESS FOR PREPARATION THEREOF.
Inventors
- 👤 Yoshikazu Kashiro
- 👤 Ryouzo Takada
- 👤 Takaya Yasumoto
- 👤 Masakazu Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 22:10
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02; C08G69/26; C08G69/265; C07; C07C; C07C51/00; C07C51/41; C07C51/412
Claims Analysis
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-02 | 1975-02-01 | 1975-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-02 | 1979-02-01 | 1979-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-02 | 1983-02-01 | 1983-08-03 | $7700.00 | Window Closed / Lapsed |