US3485730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
On-off operation of chlor-alkali diaphragm cells
Assignee: Hooker Chemical Corp
•
Filing: 1967-06-02
•
Granted: 1969-12-23
•
Expires: 1987-06-02
Abstract
No abstract record available.
Inventors
- 👤 Carl W Virgil Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:37
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B15/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1126627A
Cited
US2569329A
Cited
US2954333A
Cited
US3250691A
Cited
US3293161A
Cited
US3383295A
Cited
US3312609A
Cited
US3403083A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-22 | 1973-06-23 | 1973-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-22 | 1977-06-23 | 1977-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-22 | 1981-06-23 | 1981-12-23 | $7700.00 | Window Closed / Lapsed |