Patent US3135677A successfully refreshed from Google Patents.
US3135677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Durable anode protective system
Assignee: Thermo-Craft Electric Corp
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Filing: 1961-02-02
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Granted: 1964-06-02
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Expires: 1981-02-02
Abstract
No abstract record available.
Inventors
- 👤 Harry C Fischer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:12
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/04; C23F13/06; C23F13/08; C23F13/10; C23F13/18; F; F24; F24H; F24H9/00; F24H9/40; F24H9/45; F24H9/455
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
164 words
A HOT-WATER HEATER HAVING A METAL TANK WITH A LINING OF DIELECTRIC MATERIAL AND MEANS TO PREVENT CORROSION AT IMPERFECTIONS WHICH MAY EXIST IN SAID TANK LINING, SAID MEANS INCLUDING A PLUG SCREWED INTO THE TOP OF THE TANK AND DUAL ELECTRODES SUPPORTED BY SAID PLUG AND EXTENDING INTO THE TANK, A FIRST ONE OF SAID ELECTRODES EXTENDING CLOSE TO THE BOTTOM OF SAID TANK AND THE SECOND ONE OF SAID ELECTRODES TERMINATING CLOSE TO THE TOP OF SAID TANK, AN INSULATING COATING ON SAID FIRST ELECTRODE, SAID SECOND ELECTRODE BEING SUPERPOSED ON SAID COATING AND SUPPORTED BY SAID FIRST ELECTRODE, SAID COATING TERMINATING SHORT OF THE ENDS OF SAID FIRST ELECTRODE, AN INSULATING SLEEVE SURROUNDING BOTH ELECTRODES AND MOUNTED IN THE PLUG, A CONTROL DEVICE CONNECTED TO BOTH ELECTRODES, AND MEANS IN SAID CONTROL DEVICE OPERATIVE TO DECREASE THE FLOW OF CU RRENT THROUGH THE FIRST ELECTRODE UPON DECREASE OF LEVEL OF WATER IN THE TANK BELOW THE LEVEL OF THE SECOND ELECTRODE.
Claim 2
Dependent Claim
164 words
A HOT-WATER HEATER HAVING A METAL TANK WITH A LINING OF DIELECTRIC MATERIAL AND MEANS TO PREVENT CORROSION AT IMPERFECTIONS WHICH MAY EXIST IN SAID TANK LINING, SAID MEANS INCLUDING A PLUG SCREWED INTO THE TOP OF THE TANK AND DUAL ELECTRODES SUPPORTED BY SAID PLUG AND EXTENDING INTO THE TANK, A FIRST ONE OF SAID ELECTRODES EXTENDING CLOSE TO THE BOTTOM OF SAID TANK AND THE SECOND ONE OF SAID ELECTRODES TERMINATING CLOSE TO THE TOP OF SAID TANK, AN INSULATING COATING ON SAID FIRST ELECTRODE, SAID SECOND ELECTRODE BEING SUPERPOSED ON SAID COATING AND SUPPORTED BY SAID FIRST ELECTRODE, SAID COATING TERMINATING SHORT OF THE ENDS OF SAID FIRST ELECTRODE, AN INSULATING SLEEVE SURROUNDING BOTH ELECTRODES AND MOUNTED IN THE PLUG, A CONTROL DEVICE CONNECTED TO BOTH ELECTRODES, AND MEANS IN SAID CONTROL DEVICE OPERATIVE TO DECREASE THE FLOW OF CU RRENT THROUGH THE FIRST ELECTRODE UPON DECREASE OF LEVEL OF WATER IN THE TANK BELOW THE LEVEL OF THE SECOND ELECTRODE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |