US3566202A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-resonant ignition coil and system
Assignee: Old Carco LLC
•
Filing: 1968-06-03
•
Granted: 1971-02-23
•
Expires: 1988-06-03
Abstract
Abstract An ignition coil of low internal impedance and high energy storage and transfer characteristics and having an electrostatic shield between the coil primary and the coil secondary surrounding the primary and additional capacity resonating the secondary to a high frequency providing improved operating efficiency and prolonged spark duration of a spark plug load connected thereto.
Inventors
- 👤 Sherman C Carr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:34
CPC Classifications
H; H01; H01F; H01F38/00; H01F38/12; F; F02; F02P; F02P3/00; F02P3/02; F02P3/04
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
96 words
An ignition coil comprising a core; a primary winding around said core; an open-circuited electrostatic shield in the form of an electrically conducting sheet of material spaced from and wrapped about the primary winding with the starting and finishing ends of the wrapped sheet in overlapping but slightly spaced apart relation to one another; a secondary winding surRounding said electrostatic shield and having an electrical connection thereto; and an additional capacitance electrically connected across the secondary winding to increase the energy storage and current delivery capability of the coil and to decrease the internal impedance thereof.
Claim 2
Dependent Claim
96 words
An ignition coil comprising a core; a primary winding around said core; an open-circuited electrostatic shield in the form of an electrically conducting sheet of material spaced from and wrapped about the primary winding with the starting and finishing ends of the wrapped sheet in overlapping but slightly spaced apart relation to one another; a secondary winding surRounding said electrostatic shield and having an electrical connection thereto; and an additional capacitance electrically connected across the secondary winding to increase the energy storage and current delivery capability of the coil and to decrease the internal impedance thereof.
Claim 3
Dependent Claim
22 words
An ignition coil according to claim 1 wherein said additional capacitance comprises an electrically conducting foil element spaced from said secondary winding.
Claim 4
Dependent Claim
42 words
An ignition coil according to claim 2 including: a body portion enclosing said windings, shield and foil element; and a mounting clamp surrounding said body portion and electrically cooperating with said foil element to form the other element of said additional capacitance.
Claim 5
Dependent Claim
32 words
An ignition coil assembly according to claim 3 wherein, said mounting clamp is of split, discontinuous formation at the adjacent ends thereof which are insulatingly spaced apart in open circuit electrical relation.
Claim 6
Dependent Claim
18 words
An ignition coil assembly according to claim 4 and wherein said coil includes a ferrite material central core.
Claim 7
Dependent Claim
28 words
An ignition coil assembly according to claim 6 wherein said body portion is composed of a high dielectric material completely surrounding said core, windings, shield and foil element.
Claim 8
Dependent Claim
41 words
An ignition coil assembly according to claim 6 wherein said body portion is comprised of an epoxy material cast about said core, windings, shield and foil element all of which are insulatingly spaced apart by the material of the body portion.
Claim 9
Dependent Claim
89 words
An ignition coil assembly according to claim 8 wherein said coil further includes: first and second low voltage terminals extending through one end of the body portion and connected electrically to the opposite ends of the primary winding; a high voltage terminal extending through another end of said body portion and electrically connected to one end of the secondary winding; and a ground terminal extending through said one end of the body portion and electrically connected to the other end of said secondary winding and to said electrostatic shield.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-22 | 1974-08-24 | 1975-02-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-22 | 1978-08-24 | 1979-02-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-22 | 1982-08-24 | 1983-02-23 | $7700.00 | Window Closed / Lapsed |