US2949550A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrokinetic apparatus
Assignee: WHITEHALL RAND Inc
•
Filing: 1957-07-03
•
Granted: 1960-08-16
•
Expires: 1977-07-03
Abstract
No abstract record available.
Inventors
- 👤 Brown Thomas Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:37
CPC Classifications
H; H02; H02N; H02N11/00; H02N11/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1974483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-08-16 | 1964-02-15 | 1964-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-08-16 | 1968-02-15 | 1968-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-08-16 | 1972-02-15 | 1972-08-16 | $7700.00 | Window Closed / Lapsed |