US3498948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reaction products of tetracarboxylic acid dianhydrides with triamines and mixtures of triamines and diamines
Assignee: Toray Industries Inc
•
Filing: 1966-09-13
•
Granted: 1970-03-03
•
Expires: 1986-09-13
Abstract
No abstract record available.
Inventors
- 👤 Muneyoshi Minami
- 👤 Haruki Maekawa
- 👤 Takashi Kubota
- 👤 Yoshizo Tsuda
- 👤 Kazuo Kitamura
- 👤 Yoshitaka Tatsuno
- 👤 Masamoto Watanabe
- 👤 Yasuro Kawabata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:41
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/20
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3190856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |