US2808392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polyamides having furan nucleus or tetrahydrofuran nucleus and process for producingthe same
Assignee: Individual
•
Filing: 1953-07-23
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Granted: 1957-10-01
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Expires: 1973-07-23
Abstract
No abstract record available.
Inventors
- 👤 Hachihama Yoshikazu
- 👤 Hayashi Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 16:43
CPC Classifications
C; C08; C08G; C08G69/00; C08G69/40
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
A POLYAMIDE HAVING A NUCLEUS SELECTED FROM THE GROUP CONSISTING OF FURAN AND TETRAHYDROFURAN DERIVED FROM THE CONDENSATION-POLYMERIZATION OF A SUBSTANCE SESELECTED FROM THE GROUP CONSISTING OF FURAN-A,A''-DIPROPIONIC ACID AND TETRAHYDROFURAN -A,A''- DIPROPIONIC ACID WITH A SUBSTANCE SELECTED FROM THE GROUP CONSISTING OF HEXAMETHYLENE DIAMINE AND DECAMETHYLENE DIAMINE.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |