US3753670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrocarbon fuel compositions
Assignee: Shell USA Inc
•
Filing: 1970-06-30
•
Granted: 1973-08-21
•
Expires: 1990-06-30
Abstract
Abstract Liquid hydrocarbon fuel compositions, especially gasolines, containing certain hydrocarbyl polyamines, effectively nullify and/or inhibit fouling of vital parts of internal combustion engines.
Inventors
- 👤 A Strang
- 👤 C H Robinson Isaac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 01:52
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/234; C10L1/238; C10L1/2383
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
42 words
A method for reducing hydrocarbon exhaust gas emissions by operating an internal combustion engine on a gasoline fuel containing between 0.001 and 0.1 percent by weight of N''-polyisobutenyl-N,N-dimethylpropylene-1,3-diamine wherein the polyisobutenyl group has at least 50 and less than 200 carbon atoms.
Claim 2
Dependent Claim
12 words
The composition of claim 1 in which the alkyl groups are methyl.
Claim 3
Dependent Claim
20 words
The composition of cLaim 1 in which the amount of the diamine is between 0.001 and 0.1 percent by weight.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |