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US3467586A
Expired / Lapsed
US
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Rejuvenation of diaphragms for chlor-alkali cells
Assignee: Hooker Chemical Corp
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Filing: 1965-04-12
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Granted: 1969-09-16
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Expires: 1985-04-12
Abstract
No abstract record available.
Inventors
- 👤 Morris P Grotheer
- 👤 Edward H Cook Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:12
CPC Classifications
C; C25; C25B; C25B13/00; C25B13/04; C25B13/05; C25B13/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1309214A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-15 | 1973-03-17 | 1973-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-15 | 1977-03-17 | 1977-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-15 | 1981-03-17 | 1981-09-16 | $7700.00 | Window Closed / Lapsed |