US2864463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Internal purifier
Assignee: Centrifix Corp
•
Filing: 1955-07-29
•
Granted: 1958-12-16
•
Expires: 1975-07-29
Abstract
No abstract record available.
Inventors
- 👤 Campbell Charles Langdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:57
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/02; C02F1/04; C02F1/043; B; B04; B04C; B04C1/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1539435A
Cited
US2732909A
Cited
US1917606A
Cited
US1898608A
Cited
US2489903A
Cited
US2560070A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-12-15 | 1962-06-16 | 1962-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-15 | 1966-06-16 | 1966-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-15 | 1970-06-16 | 1970-12-16 | $7700.00 | Window Closed / Lapsed |