US3666924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric resistance convection heater
Assignee: YORK-LUXAIRE Inc A CORP OF DE
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Filing: 1970-11-16
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Granted: 1972-05-30
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Expires: 1990-11-16
Abstract
Abstract An electric resistance convection heater comprising a stack of electrically conductive fin electrodes mounted in spaced relation on a plurality of electrically insulating support elements with spacer washers therebetween, certain of said spacers being formed of insulating material and others being formed of conductive material to cause an electric current applied to different ones of said electrodes to flow serially through the electrodes in a predetermined path, and certain of said conductive spacers being formed of a material having a positive temperature resistance coefficient thus providing self-limiting response for the heater.
Inventors
- 👤 Erik Jensen
- 👤 Shelby L Blankenship
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:09
CPC Classifications
F; F24; F24H; F24H9/00; F24H9/18; F24H9/1854; F24H9/1863; F24H9/1872; F24H3/00; F24H3/02; F24H3/04; F24H3/0405; H; H05; H05B; H05B3/00; H05B3/10; H05B3/12; H05B3/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
183 words
An electric resistance heater comprising, a stack of a plurality of spaced apart heat convecting fin electrodes adapted to be positioned in the path of fluid to be heated, each of said electrodes being formed of thin planar sheet material having a predetermined electrical resistivity, said stack of fins being supported on a plurality of insulated support elements and maintained in closely spaced relation thereon by washer spacers on the elements, means to supply electric current to said stack through a first electric terminal connected to one of said fins and a second electric terminal connected to another of said fins, at least one of said spacer washers being formed of electrically conductive material and at least another of said washers being formed of electrically insulating material to cause electric current applied to said terminals to flow serially through said fins in a predetermined path; and at least one of said electrically conductive spacer washers being formed of resistive material having a positive temperature coefficient thereby providing a self-limiting electric resistance heater construction with which a predetermined maximum temperature may not be exceeded.
Claim 2
Dependent Claim
183 words
An electric resistance heater comprising, a stack of a plurality of spaced apart heat convecting fin electrodes adapted to be positioned in the path of fluid to be heated, each of said electrodes being formed of thin planar sheet material having a predetermined electrical resistivity, said stack of fins being supported on a plurality of insulated support elements and maintained in closely spaced relation thereon by washer spacers on the elements, means to supply electric current to said stack through a first electric terminal connected to one of said fins and a second electric terminal connected to another of said fins, at least one of said spacer washers being formed of electrically conductive material and at least another of said washers being formed of electrically insulating material to cause electric current applied to said terminals to flow serially through said fins in a predetermined path; and at least one of said electrically conductive spacer washers being formed of resistive material having a positive temperature coefficient thereby providing a self-limiting electric resistance heater construction with which a predetermined maximum temperature may not be exceeded.
Claim 3
Dependent Claim
37 words
The invention of claim 1 in which each of said support elements is formed of metal and an insulating sleeve is positioned on each supporting element to insulate the respective element from each electrode and conductive washer.
Claim 4
Dependent Claim
96 words
The invention of claim 1 in which the support elements are rods and include a first rod adjacent one end of the stack of sheet electrodes and a second rod adjacent the other end of the stack of sheet electrodes with a plurality of intermediate support rods therebetween, said electrically conductive washers being positioned alternately with insulating washers on said first and second rods only to cause said electric current to flow serially through said electrodes from top to bottom, and said electric terminals being secured to the upper and lower electrodes respectively of the stack.
Claim 5
Dependent Claim
96 words
The invention of claim 2 in which the support elements are rods and include a first rod adjacent one end of the stack of sheet electrodes and a second rod adjacent the other end of the stack of sheet electrodes with a plurality of intermediate support rods therebetween, said electrically conductive washers being positioned alternately with insulating washers on said first and second rods only to cause said electric current to flow serially through said electrodes from top to bottom, and said electric terminals being secured to the upper and lower electrodes respectively of the stack.
References Cited (Backward Citations)
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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) | 1975-05-30 | 1975-11-29 | 1976-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-30 | 1979-11-29 | 1980-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-30 | 1983-11-29 | 1984-05-30 | $7700.00 | Window Closed / Lapsed |