US3674985A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Immersion heater element
Assignee: Individual
•
Filing: 1971-01-14
•
Granted: 1972-07-04
•
Expires: 1991-01-14
Abstract
Abstract An immersion heater comprising essentially a coil obtained by winding coilwise cable sections adapted to heat in their central portions and remain cold at their ends, and a tube containing the cold outlets of said coil and of a connector for securing the immersion heater to the edge of the vessel containing the fluid to be heated is characterized in that the turns of the coil are supported by flexible and resistant longitudinal rodlike elements assembled on the same side of the coil as the cold ends thereof, and sealed in the outlet tube. This immersion heater further comprises an electrical relay following the fastening connector. The coil and tube assembly is housed in an insulating sheath formed with slots.
Inventors
- 👤 Beatrice Ragault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:10
CPC Classifications
H; H05; H05B; H05B3/00; H05B3/78
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
191 words
An immersion heater comprising an insulated heating cable comprising a major heating portion of resistance wire and opposite end portions of non-heating conductive wire, said heating cable being wound into a helical coil with spaced turns, an insulated support rod bent in hairpin shape with opposite legs connected by a bend, said legs extending lengthwise of said coil and said bend extending beyond one end of said coil, means securing the turns of said coil to said legs, end portions of said legs and said non-heating end portions of said cable extending from the end of said coil opposite said bend, a plastic tube receiving said end portions of said legs and said nonheating end portion of said cable, setable insulating material embedding said end portions of said legs, said non-heating end portions of said cable in said plastic tube and lead wires connected to said non-heating end portions of said cable to supply electric current thereto, and a plastic stopper closing the end of said plastic tube nearest said coil, said stopper having holes therethrough for said and portions of said legs and said non-heating and portions of said cable.
Claim 2
Dependent Claim
191 words
An immersion heater comprising an insulated heating cable comprising a major heating portion of resistance wire and opposite end portions of non-heating conductive wire, said heating cable being wound into a helical coil with spaced turns, an insulated support rod bent in hairpin shape with opposite legs connected by a bend, said legs extending lengthwise of said coil and said bend extending beyond one end of said coil, means securing the turns of said coil to said legs, end portions of said legs and said non-heating end portions of said cable extending from the end of said coil opposite said bend, a plastic tube receiving said end portions of said legs and said nonheating end portion of said cable, setable insulating material embedding said end portions of said legs, said non-heating end portions of said cable in said plastic tube and lead wires connected to said non-heating end portions of said cable to supply electric current thereto, and a plastic stopper closing the end of said plastic tube nearest said coil, said stopper having holes therethrough for said and portions of said legs and said non-heating and portions of said cable.
Claim 3
Dependent Claim
27 words
An immersion heater according to claim 1, comprising a second plastic tube section and a plastic elbow connecting said second tube section to said first-mentioned plastic tube.
Claim 4
Dependent Claim
35 words
An immersion heater according to claim 2, comprising relay means disposed in said second plastic tube section and connected to said heater cable, and means sealing said relay means in said second plastic tube section.
Claim 5
Dependent Claim
22 words
An immersion heater according to claim 1, comprising an electrically insulating protection tube fitting over said coil and having spiral slots therein.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |