US3455880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing polyphenylene ethers
Assignee: Asahi Kasei Corp
•
Filing: 1967-10-31
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Granted: 1969-07-15
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Expires: 1987-10-31
Abstract
No abstract record available.
Inventors
- 👤 Hidehiko Kobayashi
- 👤 Hiroshi Ohama
- 👤 Shin-Ichi Izawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:32
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/34; C08G65/38; C08G65/44; C07; C07C; C07C43/00; C07C43/02; C07C43/257; C07C43/275; C07C46/00; C07C46/02; C07C46/06; C07C46/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3306875A
Cited
US3337501A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-14 | 1973-01-13 | 1973-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-14 | 1977-01-13 | 1977-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-14 | 1981-01-13 | 1981-07-15 | $7700.00 | Window Closed / Lapsed |