Patent US4909207A successfully refreshed from Google Patents.
US4909207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning system for fuel injectors
Assignee: Nissan Motor Co Ltd
•
Filing: 1988-08-05
•
Granted: 1990-03-20
•
Expires: 2008-08-05
Abstract
Abstract Cleaning of gums, sludge and other adhering on a fuel injection valve in a fuel injection internal combustion engine can be done by driving of engine with a cleaning agent as a mixture of gasoline and an aromatic solvent. The mixture is adjusted the mixture rate thereof to satisfactorily combustion in an engine cylinder and dissolve gums, sludge and other adherings on the fuel injection valve. The cleaning agent is supplied to the engine cylinder through the fuel injection valve and during passing through the fuel injection valve it dissolves the adherings.
Inventors
- 👤 Toshio Takano
- 👤 Keiichi Shindo
- 👤 Yasuhiro Iwata
- 👤 Masamitsu Higuchi
- 👤 Atsushi Fujimoto
- 👤 Hidehiro Nishizawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:50
CPC Classifications
F; F02; F02M; F02M65/00; F02M65/007; F02M65/008
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
A cleaning device for a fuel injection valve in a fuel injection internal combustion engine, comprising: a fuel supply system for supplying fuel for driving the engine, said fuel supply system including a fuel injection valve for injecting said fuel to an induction system of the engine; a cleaning agent supply system which supplies a cleaning agent through said fuel supply system to said fuel injection valve, which cleaning agent is adapted for dissolving gums, sludge and other adherents on said fuel injection valve and for combustion in said engine; and means for releasably connecting said cleaning agent supply system to said fuel supply system when the cleaning operation is carried out; wherein said cleaning agent comprises a mixture of gasoline and additives, said additives are comprised of 75 to 60 volume percent of aromatic solvent and 15 to 40 percent of water.
Claim 2
Dependent Claim
143 words
A cleaning device for a fuel injection valve in a fuel injection internal combustion engine, comprising: a fuel supply system for supplying fuel for driving the engine, said fuel supply system including a fuel injection valve for injecting said fuel to an induction system of the engine; a cleaning agent supply system which supplies a cleaning agent through said fuel supply system to said fuel injection valve, which cleaning agent is adapted for dissolving gums, sludge and other adherents on said fuel injection valve and for combustion in said engine; and means for releasably connecting said cleaning agent supply system to said fuel supply system when the cleaning operation is carried out; wherein said cleaning agent comprises a mixture of gasoline and additives, said additives are comprised of 75 to 60 volume percent of aromatic solvent and 15 to 40 percent of water.
Claim 3
Dependent Claim
23 words
A cleaning device as set forth in claim 1, wherein said aromatic solvent is composed of fatty acid, calcium-sulfonate, butyl-cellosolve and aromatic hydrocarbon.
Claim 4
Dependent Claim
24 words
A cleaning device as set forth in claim 1, wherein said additives are mixed with the gasoline at a mixture rate 1:6 to 1:18.
References Cited (Backward Citations)
US1924722A
Cited
US2201774A
Cited
US2641267A
Cited
US3779213A
Cited
US4059123A
Cited
SU652338A1
Cited
US4167193A
Cited
SU723359A1
Cited
US4197140A
Cited
US4606311A
Cited
US4520773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |