US4699738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrically heated choke having improved control
Assignee: Individual
•
Filing: 1986-01-29
•
Granted: 1987-10-13
•
Expires: 2006-01-29
Abstract
Abstract An automatic choke mechanism including an electrical heater and a circuit for energizing the heater so that the choke is opened first at a relatively rapid rate and later at a slower rate. The means for heating the choke comprises an N.T.C. device in series circuit with a P.T.C. heater and a temperature responsive shunting circuit for shunting the N.T.C.
Inventors
- 👤 Peter DePetris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:44
CPC Classifications
F; F02; F02M; F02M1/00; F02M1/08; F02M1/10; F02M1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
139 words
A device for heating the bimetallic coil spring of an automatic choke comprising an insulating housing having a generally cup-shape, a heat sink carried by said housing and adapted to be affixed at one end thereof to the bimetallic spring, a positive temperature coefficient thermistor in engagement with said heat sink and in circuit therewith, a second heat sink in contact with another side of the positive temperature coefficient thermistor, a negative temperature coefficient thermistor carried by the cover and means for delivering electrical power to the negative temperature coefficient thermistor, said last name means being in circuit with an adjustable contact positioned in proximity to the second heat sink, and a bimetallic snap disk engaged at its outer periphery with said second heat sink and adapted to contact said adjustable contact for shunting said negative temperature coefficient thermistor.
Claim 2
Independent Claim
139 words
A device for heating the bimetallic coil spring of an automatic choke comprising an insulating housing having a generally cup-shape, a heat sink carried by said housing and adapted to be affixed at one end thereof to the bimetallic spring, a positive temperature coefficient thermistor in engagement with said heat sink and in circuit therewith, a second heat sink in contact with another side of the positive temperature coefficient thermistor, a negative temperature coefficient thermistor carried by the cover and means for delivering electrical power to the negative temperature coefficient thermistor, said last name means being in circuit with an adjustable contact positioned in proximity to the second heat sink, and a bimetallic snap disk engaged at its outer periphery with said second heat sink and adapted to contact said adjustable contact for shunting said negative temperature coefficient thermistor.
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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) | 1990-10-12 | 1991-04-13 | 1991-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-12 | 1995-04-13 | 1995-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-12 | 1999-04-13 | 1999-10-13 | $7700.00 | Window Closed / Lapsed |