US3144904A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heat trap for storage water heaters
Assignee: Individual
•
Filing: 1962-05-04
•
Granted: 1964-08-18
•
Expires: 1982-05-04
Abstract
No abstract record available.
Inventors
- 👤 Kahn Frank
- 👤 Iii James L Everett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:09
CPC Classifications
F; F28; F28D; F28D20/00; F28D20/0034; F28D20/0039; F24; F24H; F24H9/00; F24H9/12; F24H9/13; F24H9/133; F28D2020/0065; F28D2020/0069; Y; Y02; Y02E; Y02E60/00; Y02E60/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
138 words
IN A STORAGE WATER HEATER SYSTEM CONTAINING HOT WATER AND HAVING A TANK WITH A TOP WATER PIPE CONNECTION, A HEAT TRAP FITTING DISPOSED VERTICALLY THEREABOVE HAVING A BOTTOM WATER CONNECTION CONNECTED TO SAID TANK CONNECTION IN CONVECTIVE HEAT TRANSFER RELATION WITH THE WATER IN SAID TANK UNDER STANDBY CONDITIONS AND A WATER DELIVERY PIPE CONNECTION ABOVE SAID BOTTOM CONNECTION, SAID HEAT TRAP FITTING COMPRISING A CASING AND AN INTERNAL SLEEVE OF THERMAL NON-CONDUCTIG MATERIAL HAVING A VERTICAL WATER PASSAGEWAY THEREIN, SAID CASING BEING SPACED FROM SAID SLEEVE TO PROVIDE A SECOND VERTICAL WATER PASSAGEWAY BETWEEN SAID CASING AND SAID SLEEVE, COMMUNICATING WITH THE PASSAGEWAY IN SAID SLEEVE, AND THE WATER IN SAID SECOND PASSAGEWAY BEING IN THERMAL EXCHANGE RELATION WITH THE EXTERNAL ENVIRONMENT OF THE CASING PROVIDING NATURAL TEMPERATURE STRATIFICATION OF THE WATER IN SAID SECOND PASSAGEWAY.
Claim 2
Dependent Claim
138 words
IN A STORAGE WATER HEATER SYSTEM CONTAINING HOT WATER AND HAVING A TANK WITH A TOP WATER PIPE CONNECTION, A HEAT TRAP FITTING DISPOSED VERTICALLY THEREABOVE HAVING A BOTTOM WATER CONNECTION CONNECTED TO SAID TANK CONNECTION IN CONVECTIVE HEAT TRANSFER RELATION WITH THE WATER IN SAID TANK UNDER STANDBY CONDITIONS AND A WATER DELIVERY PIPE CONNECTION ABOVE SAID BOTTOM CONNECTION, SAID HEAT TRAP FITTING COMPRISING A CASING AND AN INTERNAL SLEEVE OF THERMAL NON-CONDUCTIG MATERIAL HAVING A VERTICAL WATER PASSAGEWAY THEREIN, SAID CASING BEING SPACED FROM SAID SLEEVE TO PROVIDE A SECOND VERTICAL WATER PASSAGEWAY BETWEEN SAID CASING AND SAID SLEEVE, COMMUNICATING WITH THE PASSAGEWAY IN SAID SLEEVE, AND THE WATER IN SAID SECOND PASSAGEWAY BEING IN THERMAL EXCHANGE RELATION WITH THE EXTERNAL ENVIRONMENT OF THE CASING PROVIDING NATURAL TEMPERATURE STRATIFICATION OF THE WATER IN SAID SECOND PASSAGEWAY.
References Cited (Backward Citations)
US792804A
Cited
US1051130A
Cited
US1676237A
Cited
US1863273A
Cited
US1883656A
Cited
US2100504A
Cited
US2210480A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-08-18 | 1968-02-17 | 1968-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-08-18 | 1972-02-17 | 1972-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-08-18 | 1976-02-17 | 1976-08-18 | $7700.00 | Window Closed / Lapsed |