US4020815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine carburetor air intake heater apparatus
Assignee: Individual
•
Filing: 1975-05-05
•
Granted: 1977-05-03
•
Expires: 1995-05-05
Abstract
Abstract An air heater and blower system is incorporated into an air filter for an internal combustion engine carburetor and blows heated air into the filter and into the carburetor under control of a thermostat. The air filter has an opening and a deflector plate to deflect some of the heated air against the carburetor and bowl beneath the filter so as to accumulate heat around the carburetor under the filter casing thereby increasing the efficiency of the engine in cold weather or when the temperature drops below the setting of the thermostat.
Inventors
- 👤 Richard D. Hubert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:35
CPC Classifications
F; F02; F02N; F02N19/00; F02N19/02; F02N19/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
An engine carburetor air heater apparatus comprising in combination: a carburetor air cleaner casing adapted to fit upon and be attached to a carburetor; electric heating means attached to said air cleaner casing for heating air passing thereby into a carburetor; an electric motor driven blower means attached to said air cleaner for blowing air by said heating elements through said air filter into a carburetor; and said air cleaner casing having an opening therein through the bottom portion thereof and being located to direct air under pressure from said electric motor driven blower means onto the outside of a carburetor to which the air cleaner casing is attached whereby said carburetor and fuel passing therethrough may be heated prior to starting an engine.
Claim 2
Dependent Claim
124 words
An engine carburetor air heater apparatus comprising in combination: a carburetor air cleaner casing adapted to fit upon and be attached to a carburetor; electric heating means attached to said air cleaner casing for heating air passing thereby into a carburetor; an electric motor driven blower means attached to said air cleaner for blowing air by said heating elements through said air filter into a carburetor; and said air cleaner casing having an opening therein through the bottom portion thereof and being located to direct air under pressure from said electric motor driven blower means onto the outside of a carburetor to which the air cleaner casing is attached whereby said carburetor and fuel passing therethrough may be heated prior to starting an engine.
Claim 3
Dependent Claim
41 words
The apparatus in accordance with claim 1 in which said carburetor air cleaner casing has a deflector plate located adjacent said opening to deflect air directly against the fuel bowl of the carburetor to which the air cleaner casing is attached.
Claim 4
Dependent Claim
30 words
The apparatus in accordance with claim 2 in which a thermostat is mounted onto said air cleaner casing for disengaging said heating means when said thermostat reaches a predetermined level.
Claim 5
Dependent Claim
39 words
The apparatus in accordance with claim 3 in which said heating means has a plurality of heating elements connected to opposite poles on an electric source and extending across an intake air spout of said carburetor air cleaner casing.
Claim 6
Dependent Claim
24 words
The apparatus in accordance with claim 4 in which said blower means includes attachment means for removably attaching said blower to said air cleaner.
Claim 7
Dependent Claim
35 words
The apparatus in accordance with claim 5 in which said blower means has a swirl plate mounted to increase swirling turbulence into the air entering the blower and being directed into the air filter casing.
Claim 8
Dependent Claim
35 words
The apparatus in accordance with claim 6 in which said electrically driven blower means and thermostat are connected through the ignition switch for actuating the engine to which the carburetor and air cleaner are attached.
Claim 9
Dependent Claim
26 words
The apparatus in accordance with claim 7 in which said blower and heating elements are connected through a master switch for disengaging both by an operator.
Claim 10
Dependent Claim
23 words
The apparatus in accordance with claim 8 in which said air cleaner casing is attached upon a carburetor having the choke removed therefrom.
Claim 11
Dependent Claim
18 words
The apparatus in accordance with claim 9 in which said thermostat is adjustable for actuation at different temperatures.
References Cited (Backward Citations)
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Cited
US2918787A
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US3397684A
Cited
US3441011A
Cited
US3492457A
Cited
US3728856A
Cited
US3880152A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-02 | 1980-11-01 | 1981-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-02 | 1984-11-01 | 1985-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-02 | 1988-11-01 | 1989-05-03 | $7700.00 | Window Closed / Lapsed |