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US2018169A
Expired / Lapsed
US
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Mechanism for automatically flushing water tanks
Assignee: Williams Oil O Matic Heating Corp
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Filing: 1933-12-28
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Granted: 1935-10-22
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Expires: 1953-12-28
Abstract
No abstract record available.
Inventors
- 👤 Walter W Williams
- 👤 Glenn F Zellhoefer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:42
CPC Classifications
E; E03; E03D; E03D1/00; E03D1/02; E03D1/16; Y; Y10; Y10T; Y10T137/00; Y10T137/7287; Y10T137/7303; Y10T137/7313; Y10T137/7316; Y10T137/7319; Y10T137/7323
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) | 1938-10-21 | 1939-04-22 | 1939-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-10-21 | 1943-04-22 | 1943-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-10-21 | 1947-04-22 | 1947-10-22 | $7700.00 | Window Closed / Lapsed |