US3394089A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ion exchange catalyst for the preparation of bisphenols
Assignee: Dow Chemical Co
•
Filing: 1964-12-02
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Granted: 1968-07-23
•
Expires: 1984-12-02
Abstract
No abstract record available.
Inventors
- 👤 Mcnutt Boyd Wayne
- 👤 Gammill Benny Bryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:03
CPC Classifications
B; B01; B01J; B01J31/00; B01J31/02; B01J31/06; B01J31/08; B01J31/10; C; C07; C07C; C07C37/00; C07C37/11; C07C37/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3049568A
Cited
US3153001A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |