Patent US3539679A successfully refreshed from Google Patents.
US3539679A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polynosic fibers
Assignee: Mitsubishi Chemical Corp
•
Filing: 1966-08-02
•
Granted: 1970-11-10
•
Expires: 1986-08-02
Abstract
No abstract record available.
Inventors
- 👤 Yukio Kimura
- 👤 Taro Yamamura
- 👤 Atsushi Kawai
- 👤 Masamichi Ikeda
- 👤 Takehiro Katsuyama
- 👤 Takanori Oda
- 👤 Sakae Kondo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:03
CPC Classifications
D; D01; D01F; D01F2/00; D01F2/06; D01F2/08; D01F2/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2860480A
Cited
US3038778A
Cited
US3084021A
Cited
US3351696A
Cited
US3226461A
Cited
US3324216A
Cited
US3381075A
Cited
US3320117A
Cited
US3352957A
Cited
US3139467A
Cited
US3341645A
Cited
US3388117A
Cited
US3419652A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |