US4091265A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fuel filter heating assembly
Assignee: Parker Hannifin Corp
•
Filing: 1975-08-06
•
Granted: 1978-05-23
•
Expires: 1995-08-06
Abstract
Abstract A solid state fuel heater unit for use in heating the fuel flow in a fuel filter is disclosed which unit includes a heat conducting ring having a power transistor mounted thereon and driving a power resistor mounted therewithin. Circuitry for controlling the operation of the power transistor, including a thermistor, is mounted within the ring by means of component sealant or potting material which isolates the thermistor from direct transfer of heat thereto from the power transistor and power resistor. The heater unit is adapted to be immersed in the flow of fuel in a fuel filter with the axis of the ring substantially parallel to the fuel flow through the filter.
Inventors
- 👤 Mark S. Richards
- 👤 Robert Zeff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:33
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0227; H05B1/023; H05B1/0244; B; B01; B01D; B01D35/00; B01D35/18; B01D36/00; B01D36/003; F; F02; F02M; F02M31/00; F02M31/02; F02M31/12; F02M31/125; F02M37/00; F02M37/22; F02M37/30; G; G05; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/20; G05D23/24; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
145 words
A solid state fuel heater unit for use in heating a fuel flow comprising: (a) a heat conducting mounting member; (b) a power transistor mounted on said mounting member in heat conducting relation thereto; (c) a power resistor mounted on said mounting member in heat exchanging relation thereto and electrically connected in series with said power transistor, (d) an electrical control circuit, including a thermistor, for controlling the operation of said power transistor, said control circuit being mounted on said mounting member by means of a component sealant isolating said thermistor from direct transfer of heat thereto by said power resistor and said power transistor, and (e) means for mounting said mounting member in a fuel flow with said power transistor, power resistor and mounting member in heat exchange relation to the fuel flow and said thermistor in temperature sensing relation to the fuel flow.
Claim 2
Dependent Claim
145 words
A solid state fuel heater unit for use in heating a fuel flow comprising: (a) a heat conducting mounting member; (b) a power transistor mounted on said mounting member in heat conducting relation thereto; (c) a power resistor mounted on said mounting member in heat exchanging relation thereto and electrically connected in series with said power transistor, (d) an electrical control circuit, including a thermistor, for controlling the operation of said power transistor, said control circuit being mounted on said mounting member by means of a component sealant isolating said thermistor from direct transfer of heat thereto by said power resistor and said power transistor, and (e) means for mounting said mounting member in a fuel flow with said power transistor, power resistor and mounting member in heat exchange relation to the fuel flow and said thermistor in temperature sensing relation to the fuel flow.
Claim 3
Dependent Claim
62 words
A solid state fuel heater unit as claimed in claim 1 wherein said mounting member is a metallic ring having said power transistor mounted thereon and said power resistor mounted therewithin and wherein said means for mounting said mounting member in said fuel flow is adapted to mount said metallic ring with its axis generally parallel to the direction of fuel flow.
Claim 4
Dependent Claim
69 words
A solid state fuel heater unit as claimed in claim 2 including a second power transistor mounted on said metallic ring and a second power resistor mounted within said metallic ring, said second power transistor and second power resistor being electrically connected in series with each other and in parallel with said series connected first power transistor and said first power resistor for control by said electrical control circuit.
Claim 5
Dependent Claim
28 words
A solid state fuel heater unit as claimed in claim 3 wherein said first and second power transistor are mounted on the outer periphery of said metallic ring.
Claim 6
Dependent Claim
28 words
A solid state fuel heater unit as claimed in claim 4 wherein said electrical control circuit is mounted within said metallic ring by means of said component sealant.
References Cited (Backward Citations)
US564657A
Cited
US1806701A
Cited
US2103434A
Cited
US2302489A
Cited
US2429321A
Cited
US3320407A
Cited
US3333086A
Cited
US3243572A
Cited
US3517162A
Cited
US3413438A
Cited
US3393870A
Cited
DE2150585A1
Cited
DE2255736A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |