US3425928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anolyte liquid level control for chlor-alkali diaphragm cells
Assignee: Hooker Chemical Corp
•
Filing: 1965-11-29
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Granted: 1969-02-04
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Expires: 1985-11-29
Abstract
No abstract record available.
Inventors
- 👤 Alvin T Emery
- 👤 Charles W Schmidtke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:00
CPC Classifications
C; C25; C25B; C25B1/00; C25B1/01; C25B1/34; C25B1/46; C25B15/00; C25B15/08; C25B15/085; C25B9/00; C25B9/17; C25B9/19; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8359; Y10T137/8593; Y10T137/86236; Y10T137/8626
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1558085A
Cited
US1930618A
Cited
US1884855A
Cited
US2460159A
Cited
US2867213A
Cited
US3301310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-04 | 1972-08-05 | 1973-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-04 | 1976-08-05 | 1977-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-04 | 1980-08-05 | 1981-02-04 | $7700.00 | Window Closed / Lapsed |