US3221725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Distributor having centrifugal advance and retard
Assignee: Motors Liquidation Co
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Filing: 1964-03-16
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Granted: 1965-12-07
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Expires: 1984-03-16
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Julian
- 👤 Robert E Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:47
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
AN IGNITION SPARK CONTROL DEVICE COMPRISING: SPARK ADVANCE MEANS RESPONSIVE TO PRESSURE IN AN ENGINE INTAKE MANIFOLD THAT IS NEGATIVELY PRESSURIZED UNDER LOW ENGINE SPEED AND LOW ENGINE LOAD CONDITIONS, SAID SPARK ADVANCE MEANS RESPONSIVE TO HIGHER LOADS TO RETARD THE IGNITION SPARK FROM A PREVIOUSLY ESTABLISHED ADVANCE POINT; SPARK RETARD MEANS INCLUDING CENTRIFUGAL MEANS FOR RETARDING THE IGNITION SPARK FROM A POINT ESTABLISHED BY THE SPARK ADVANCE MEANS RESPONSIVE TO INTAKE MANIFOLD PRESSURE TO A FURTHER RETARDED POINT DURING CONDITIONS OF INCREASING ENGINE SPEED, SAID SPARK RETARD MEANS BEING LIMITED TO A PREDETERMINED AMOUNT OF SPARK RETARD; AND SPARK ADVANCE MECHANISM RESPONSIVE TO AN INCREASED ENGINE SPEED TO ADVANCE THE SPARK FROM THE LIMIT OF RETARD TO A LIMIT OF ADVANCE AS THE ENGINE SPEED INCREASES TO ITS LIMIT.
Claim 2
Dependent Claim
130 words
AN IGNITION SPARK CONTROL DEVICE COMPRISING: SPARK ADVANCE MEANS RESPONSIVE TO PRESSURE IN AN ENGINE INTAKE MANIFOLD THAT IS NEGATIVELY PRESSURIZED UNDER LOW ENGINE SPEED AND LOW ENGINE LOAD CONDITIONS, SAID SPARK ADVANCE MEANS RESPONSIVE TO HIGHER LOADS TO RETARD THE IGNITION SPARK FROM A PREVIOUSLY ESTABLISHED ADVANCE POINT; SPARK RETARD MEANS INCLUDING CENTRIFUGAL MEANS FOR RETARDING THE IGNITION SPARK FROM A POINT ESTABLISHED BY THE SPARK ADVANCE MEANS RESPONSIVE TO INTAKE MANIFOLD PRESSURE TO A FURTHER RETARDED POINT DURING CONDITIONS OF INCREASING ENGINE SPEED, SAID SPARK RETARD MEANS BEING LIMITED TO A PREDETERMINED AMOUNT OF SPARK RETARD; AND SPARK ADVANCE MECHANISM RESPONSIVE TO AN INCREASED ENGINE SPEED TO ADVANCE THE SPARK FROM THE LIMIT OF RETARD TO A LIMIT OF ADVANCE AS THE ENGINE SPEED INCREASES TO ITS LIMIT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |