Patent US3920041A successfully refreshed from Google Patents.
US3920041A
Expired / Lapsed
US
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Fluid flow control device
Assignee: Ford Motor Co
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Filing: 1973-11-05
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Granted: 1975-11-18
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Expires: 1993-11-05
Abstract
Abstract A fluid flow control device is inserted in the vacuum lines connecting the carburetor spark and manifold vacuum ports to the ignition distributor adjusting servo actuator, the device having a number of orifices and one-way check valves to provide a different slow rate of pressure equalization during decelerations than during accelerations, for good performance as well as emission control.
Inventors
- 👤 Karl H Gropp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:11
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/10; F02P5/103; F02P5/106; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7838; Y10T137/7839; Y10T137/8593; Y10T137/87265; Y10T137/87539; Y10T137/87555
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
198 words
A fluid flow control device for use in a vacuum line connected to a source or pressure at one end varying between atmospheric and subatmospheric levels and at its other end to a fluid chamber, the device including a first flow restriction delaying communication of a pressure change at one rate from one side of the restriction to the other, a bypass line bypassing the first restriction and containing additional flow restriction means and other means in series with the additional flow restriction means rendering the latter operable concurrent with the first restriction in response to a predetermined change in pressure on one side of the first restriction relative to the pressure on the other side, to provide at times a different rate of equalization of pressures, a second line connected at one end to a second source of pressure varying between atmospheric and subatmospheric levels and at its other end to the fluid chamber, and further means in the second line operable in response to a predetermined pressure level at the second source to immediately equalize the pressures at the second source and fluid chamber regardless of the operativeness of the first restriction and additional restriction means.
Claim 2
Dependent Claim
198 words
A fluid flow control device for use in a vacuum line connected to a source or pressure at one end varying between atmospheric and subatmospheric levels and at its other end to a fluid chamber, the device including a first flow restriction delaying communication of a pressure change at one rate from one side of the restriction to the other, a bypass line bypassing the first restriction and containing additional flow restriction means and other means in series with the additional flow restriction means rendering the latter operable concurrent with the first restriction in response to a predetermined change in pressure on one side of the first restriction relative to the pressure on the other side, to provide at times a different rate of equalization of pressures, a second line connected at one end to a second source of pressure varying between atmospheric and subatmospheric levels and at its other end to the fluid chamber, and further means in the second line operable in response to a predetermined pressure level at the second source to immediately equalize the pressures at the second source and fluid chamber regardless of the operativeness of the first restriction and additional restriction means.
Claim 3
Dependent Claim
15 words
A control device as in claim 1, the further means comprising a one-way check valve.
Claim 4
Dependent Claim
15 words
A control device as in claim 2, the other means comprising a one-way check valve.
Claim 5
Dependent Claim
19 words
A control device as in claim 1, including means providing a controlled interconnection between the first and second sources.
Claim 6
Dependent Claim
51 words
A control device as in claim 3, the further means check valve being operable at a higher predetermined pressure level than the other means check valve for providing concurrent operation of the first and additional restriction means at pressure levels between the predetermined preSsure levels of the other and further means.
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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |