Patent US3421161A successfully refreshed from Google Patents.
US3421161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Two-way flush tank control
Assignee: FARL W WARRINER SR
•
Filing: 1966-06-06
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Granted: 1969-01-14
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Expires: 1986-06-06
Abstract
No abstract record available.
Inventors
- 👤 Robert L Stafford
- 👤 Farl W Warriner Sr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:54
CPC Classifications
E; E03; E03D; E03D1/00; E03D1/02; E03D1/14; E03D1/142; E03D1/144
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1345920A
Cited
US2724838A
Cited
US2741776A
Cited
US2731647A
Cited
US2817849A
Cited
US2803833A
Cited
US2950483A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-14 | 1972-07-15 | 1973-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-14 | 1976-07-15 | 1977-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-14 | 1980-07-15 | 1981-01-14 | $7700.00 | Window Closed / Lapsed |