US2952722A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reciprocating zone purification
Assignee: Individual
•
Filing: 1957-12-05
•
Granted: 1960-09-13
•
Expires: 1977-12-05
Abstract
No abstract record available.
Inventors
- 👤 Jackson Walter Burton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:59
CPC Classifications
C; C30; C30B; C30B13/00; C30B13/32
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2765361A
Cited
US1281673A
Cited
US2280770A
Cited
US2491210A
Cited
US2719799A
Cited
US2773923A
Cited
US2801192A
Cited
US2782287A
Cited
US2835612A
Cited
US2743199A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-09-13 | 1964-03-14 | 1964-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-09-13 | 1968-03-14 | 1968-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-09-13 | 1972-03-14 | 1972-09-13 | $7700.00 | Window Closed / Lapsed |