Patent US2374515A successfully refreshed from Google Patents.
Patent US3396950A successfully refreshed from Google Patents.
US3396950A
Expired / Lapsed
US
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Diffuser for sewage treatment
Assignee: Individual
•
Filing: 1967-01-16
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Granted: 1968-08-13
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Expires: 1987-01-16
Abstract
No abstract record available.
Inventors
- 👤 Elmer R Wood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:05
CPC Classifications
C; C02; C02F; C02F3/00; C02F3/02; C02F3/12; C02F3/20; B; B01; B01F; B01F23/00; B01F23/20; B01F23/23; B01F23/231; B01F23/23105; B01F23/2312; B01F23/23121; B01F23/23123; B01F23/23126; B01F23/231262; Y; Y02; Y02W; Y02W10/00; Y02W10/10; Y10; Y10S; Y10S261/00; Y10S261/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA731213A
Cited
US1117601A
Cited
US1731779A
Cited
US2038451A
Cited
US2911205A
Cited
US3083953A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-08-13 | 1972-02-12 | 1972-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-13 | 1976-02-12 | 1976-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-13 | 1980-02-12 | 1980-08-13 | $7700.00 | Window Closed / Lapsed |