US3185170A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid purification apparatus
Assignee: Individual
•
Filing: 1961-06-22
•
Granted: 1965-05-25
•
Expires: 1981-06-22
Abstract
No abstract record available.
Inventors
- 👤 George H Westman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:01
CPC Classifications
E; E03; E03B; E03B7/00; E03B7/07; E03B7/074; C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/686; Y; Y10; Y10T; Y10T137/00; Y10T137/4891
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US461235A
Cited
US985757A
Cited
US1681362A
Cited
US2532973A
Cited
US2628129A
Cited
US2683622A
Cited
US2989979A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-05-24 | 1968-11-23 | 1969-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-05-24 | 1972-11-23 | 1973-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-05-24 | 1976-11-23 | 1977-05-25 | $7700.00 | Window Closed / Lapsed |