US3825508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyamide from methyl substituted phthalic acid by melt polymerization in the presence of reducing phosphorus acid compound
Assignee: Teijin Ltd
•
Filing: 1972-05-04
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Granted: 1974-07-23
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Expires: 1992-05-04
Abstract
Abstract A MELT-POLYMERIZED POLYAMIDE COMPOSITION DERIVED FROM 85 TO 100 MOL PERCENT IN TOTAL OF A DIAMINE AND A METHYL-SUBSTITUTED PHTHALIC ACID SELECTED FROM THE GROUP CONSISTING OF METHYLTEREPHTHALIC ACID AND METHYLISOPHTHALIC ACID, 15 TO 0 MOL PERCENT OF A COMONOMER SELECTED FROM THE GROUP CONSISTING OF DICARBOXYLIC ACIDS OTHER THAN THE METHYL-SUBSTITUTED PHTHALIC ACID, AMINOCARBOXYLIC ACIDS AND LACTAMS THEREOF, AND A REDUCING PHOSPHORUS ACID COMPOUND.
Inventors
- 👤 K Nawata
- 👤 T Shinoki
- 👤 T Ashida
- 👤 O Kurihara
- 👤 N Saiki
- 👤 Y Fujita
- 👤 G Yamashita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:10
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/02
Claims Analysis
Total Claims: 0
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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) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |