US2075175A
Expired / Lapsed
US
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Method and apparatus for purifying liquids
Assignee: Individual
•
Filing: 1935-02-14
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Granted: 1937-03-30
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Expires: 1955-02-14
Abstract
No abstract record available.
Inventors
- 👤 Thomas W Byrd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:05
CPC Classifications
A; A01; A01J; A01J11/00; A01J11/06; B; B01; B01D; B01D33/00; B01D33/06; B01D33/11; B01D33/35; B01D33/41; B01D33/42; B01D33/58; B01D33/62; B01D33/66; B01D33/666; B01D2201/00; B01D2201/28; B01D2201/287
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1940-03-29 | 1940-09-28 | 1941-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-03-29 | 1944-09-28 | 1945-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-03-29 | 1948-09-28 | 1949-03-30 | $7700.00 | Window Closed / Lapsed |