US2698291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathodically protected domestic water storage tank and heater
Assignee: AO Smith Corp
•
Filing: 1951-06-04
•
Granted: 1954-12-28
•
Expires: 1971-06-04
Abstract
No abstract record available.
Inventors
- 👤 Orrin E Andrus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:07
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/06; F; F24; F24H; F24H9/00; F24H9/40; F24H9/45; F24H9/455; F24H1/00; F24H1/18; F24H1/20; F24H1/201; F24H1/202
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A DOMESTIC WATER HEATER COMPRISING AN OUTER CASING, A METAL SHELL WITHIN THE CASING FOR STORING THE HEATED WATER, A CERAMIC ENAMEL LINING FUSED TO THE INTERIOR OF THE SHELL TO PROTECT THE SHELL AGAINST CORROSION, HEAT INSULATING MATERIAL DISPOSED IN THE SPACE BETWEEN SAID CASING AND SHELL TO REDUCE THE HEAT LOSS FROM THE SHELL TO THE CASING AND PROVIDE A SUBSTANTIAL TEMPERATURE DIFFERENTIAL THEREBETWEEN, AN ANODE OF NON-CORRODIBLE METAL DISPOSED WITHIN THE SHELL AND EXPOSED TO THE WATER THEREIN, A THERMOPILE SURROUNDED BY SAID HEAT INSULATING MATERIAL AND LOCATED BETWEEN THE SHELL AND CASING AND HAVING ITS HOT AND COLD JUNCTIONS DISPOSED TO BE RESPONSIVE TO THE TEMPERATURES, RESPECTIVELY, OF THE EXTERIOR OF THE SHELL AND THE CASING, AND MEANS CONNECTING POSITIVE AND NEGATIVE TERMINALS OF SAID THERMOPILE, RESPECTIVELY, TO SAID ANODE AND SAID SHELL TO CATHODICALLY PROTECT THE METAL OF THE SHELL EXPOSED BY DEFECTS IN THE CERAMIC ENAMEL FROM CORROSION BY THE WATER.
Claim 2
Dependent Claim
157 words
A DOMESTIC WATER HEATER COMPRISING AN OUTER CASING, A METAL SHELL WITHIN THE CASING FOR STORING THE HEATED WATER, A CERAMIC ENAMEL LINING FUSED TO THE INTERIOR OF THE SHELL TO PROTECT THE SHELL AGAINST CORROSION, HEAT INSULATING MATERIAL DISPOSED IN THE SPACE BETWEEN SAID CASING AND SHELL TO REDUCE THE HEAT LOSS FROM THE SHELL TO THE CASING AND PROVIDE A SUBSTANTIAL TEMPERATURE DIFFERENTIAL THEREBETWEEN, AN ANODE OF NON-CORRODIBLE METAL DISPOSED WITHIN THE SHELL AND EXPOSED TO THE WATER THEREIN, A THERMOPILE SURROUNDED BY SAID HEAT INSULATING MATERIAL AND LOCATED BETWEEN THE SHELL AND CASING AND HAVING ITS HOT AND COLD JUNCTIONS DISPOSED TO BE RESPONSIVE TO THE TEMPERATURES, RESPECTIVELY, OF THE EXTERIOR OF THE SHELL AND THE CASING, AND MEANS CONNECTING POSITIVE AND NEGATIVE TERMINALS OF SAID THERMOPILE, RESPECTIVELY, TO SAID ANODE AND SAID SHELL TO CATHODICALLY PROTECT THE METAL OF THE SHELL EXPOSED BY DEFECTS IN THE CERAMIC ENAMEL FROM CORROSION BY THE WATER.
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) | 1957-12-27 | 1958-06-28 | 1958-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-27 | 1962-06-28 | 1962-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-27 | 1966-06-28 | 1966-12-28 | $7700.00 | Window Closed / Lapsed |