Patent US3056419A successfully refreshed from Google Patents.
US3056419A
Expired / Lapsed
US
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Liquid purification apparatus
Assignee: Individual
•
Filing: 1960-05-19
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Granted: 1962-10-02
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Expires: 1980-05-19
Abstract
No abstract record available.
Inventors
- 👤 George H Westman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:10
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/72; C02F1/76; C02F1/68; C02F1/685; C02F1/686; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3115; Y10T137/3127; Y10T137/4891
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2493870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-01 | 1966-04-02 | 1966-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-01 | 1970-04-02 | 1970-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-01 | 1974-04-02 | 1974-10-02 | $7700.00 | Window Closed / Lapsed |