US3249303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination gas and electric hot water heating system
Assignee: Individual
•
Filing: 1964-07-13
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Granted: 1966-05-03
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Expires: 1984-07-13
Abstract
No abstract record available.
Inventors
- 👤 Esley L Townsend
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:34
CPC Classifications
F; F24; F24D; F24D3/00; F24D3/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
A GAS AND ELECTRIC HOT WATER HEATING SYSTEM COMPRISING, A HOT WATER RESERVOIR, AN ELECTRIC HEATING MEANS FOR HEATING THE WATER IN SAID RESERVOIR, A GAS-FIRED HOT WATER HEATING MEANS SPACED FROM SAID RESERVOIR AND HAVING A HOT WATER OUTLET AT THE UPPER PORTION OF SAID GAS-FIRED HEATING MEANS, A CONDUIT MEANS CONNECTING SAID HOT WATER OUTLET TO A LOWER PORTION OF SAID RESERVOIR WITH A U-SHAPED PORTION FORMING A TRAP, A HEAT RADIATIOR HAVING AN INLET AND OUTLET, FLOW MEANS COMMUNICATING THE UPPER PORTION OF THE RESERVOIR WITH THE RADIATOR INLET, FLOW MEANS CONNECTING THE RESERVOIR OUTLET TO THE GAS-FIRED HEATING MEANS, A FLOW CONTROL VALVE IN THE FLOW MEANS BETWEEN THE RESERVOIR AND RADIATOR, A CIRCULATOR PUMP IN THE FLOW MEANS BETWEEN THE RADIATOR AND GAS-FIRED HEATING MEANS, MEANS
Claim 2
Dependent Claim
131 words
A GAS AND ELECTRIC HOT WATER HEATING SYSTEM COMPRISING, A HOT WATER RESERVOIR, AN ELECTRIC HEATING MEANS FOR HEATING THE WATER IN SAID RESERVOIR, A GAS-FIRED HOT WATER HEATING MEANS SPACED FROM SAID RESERVOIR AND HAVING A HOT WATER OUTLET AT THE UPPER PORTION OF SAID GAS-FIRED HEATING MEANS, A CONDUIT MEANS CONNECTING SAID HOT WATER OUTLET TO A LOWER PORTION OF SAID RESERVOIR WITH A U-SHAPED PORTION FORMING A TRAP, A HEAT RADIATIOR HAVING AN INLET AND OUTLET, FLOW MEANS COMMUNICATING THE UPPER PORTION OF THE RESERVOIR WITH THE RADIATOR INLET, FLOW MEANS CONNECTING THE RESERVOIR OUTLET TO THE GAS-FIRED HEATING MEANS, A FLOW CONTROL VALVE IN THE FLOW MEANS BETWEEN THE RESERVOIR AND RADIATOR, A CIRCULATOR PUMP IN THE FLOW MEANS BETWEEN THE RADIATOR AND GAS-FIRED HEATING MEANS, MEANS
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) | 1969-05-02 | 1969-11-01 | 1970-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-05-02 | 1973-11-01 | 1974-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-05-02 | 1977-11-01 | 1978-05-03 | $7700.00 | Window Closed / Lapsed |