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US2174178A
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Apparatus for and method of treating pervious material with fluid
Assignee: Individual
•
Filing: 1936-10-31
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Granted: 1939-09-26
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Expires: 1956-10-31
Abstract
No abstract record available.
Inventors
- 👤 Henry C Nichols
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:35
CPC Classifications
D; D06; D06B; D06B5/00; D06B2700/00; D06B2700/18; Y; Y10; Y10S; Y10S8/00; Y10S8/15; Y10S8/16; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7793; Y10T137/7805; Y10T137/7806; Y10T137/7807; Y10T137/7822; Y10T137/7823; Y10T137/7825; Y10T137/8158; Y10T137/8225; Y10T137/8275; Y10T137/8292; Y10T137/8309; Y10T137/8593; Y10T137/86292; Y10T137/863; Y10T137/86308
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) | 1942-09-25 | 1943-03-27 | 1943-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-09-25 | 1947-03-27 | 1947-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-09-25 | 1951-03-27 | 1951-09-26 | $7700.00 | Window Closed / Lapsed |