US3140424A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polarity-reversing system for electrochemical process
Assignee: Individual
•
Filing: 1962-01-16
•
Granted: 1964-07-07
•
Expires: 1982-01-16
Abstract
No abstract record available.
Inventors
- 👤 William G Stech
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:08
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/18
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US290873A
Cited
US508069A
Cited
US1813541A
Cited
US1719474A
Cited
US2037565A
Cited
US2029710A
Cited
US2372061A
Cited
US2786970A
Cited
US2922929A
Cited
US2964682A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-07-07 | 1968-01-06 | 1968-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-07-07 | 1972-01-06 | 1972-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-07-07 | 1976-01-06 | 1976-07-07 | $7700.00 | Window Closed / Lapsed |