Patent US4447499A successfully refreshed from Google Patents.
Patent US3213850A successfully refreshed from Google Patents.
US3213850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water heater
Assignee: AO Smith Corp
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Filing: 1959-05-07
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Granted: 1965-10-26
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Expires: 1979-05-07
Abstract
No abstract record available.
Inventors
- 👤 Robert B Heeger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:17
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/20; F24H9/2007; F24H9/2035; F24H15/00; F24H15/20; F24H15/212; F24H15/223; F24H15/225; F24H15/30; F24H15/305; F24H15/31; F24H15/355; F24H15/36
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
IN A HOT WATER HEATER PROVIDED WITH A WATER HEATER TANK, SAID TANK HAVING AN INLET CONDUIT AND AN OUTLET CONDUIT, THE INLET CONDUIT EXTENDING FROM THE TOP PORTION OF THE TANK TO A POSITION OPENING INTO THE TANK AND SUBSTANTIALLY BELOW THE TOP PORTION AND HAVING MEANS OPENING ADJACENT TO THE SAID TOP PORTION OF THE TANK, THE COMBINATION THEREWITH OF: A VALVE CLOSURE MEMBER COOPERATING WITH THE MEANS OPENING ADJACENT THE UPPER PORTION OF THE TANK; AND MEANS RESPONSIVE TO THE TEMPERATURE OF THE WATER AT SAID UPPER PORTION FOR MOVING THE CLOSURE TO OPEN POSITION UPON INCREASE IN TEMPERATURE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-25 | 1969-04-26 | 1969-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-25 | 1973-04-26 | 1973-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-25 | 1977-04-26 | 1977-10-26 | $7700.00 | Window Closed / Lapsed |