US4236020A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbamate deposit control additives
Assignee: Chevron USA Inc
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Filing: 1979-06-18
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Granted: 1980-11-25
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Expires: 1999-06-18
Abstract
Abstract Deposit control additives for internal combustion engines are provided which maintain cleanliness of intake systems without contributing to combustion chamber deposits. The additives are poly(oxyalkylene) carbamates comprising a hydrocarbyloxy-terminated poly(oxyalkylene) chain of 2-5 carbon oxyalkylene units bonded through an oxycarbonyl group to a nitrogen atom of ethylenediamine.
Inventors
- 👤 Robert A. Lewis
- 👤 Lewis R. Honnen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 20:25
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/22; C10L1/222; C10L1/224; C08; C08G; C08G65/00; C08G65/02; C08G65/32; C08G65/329; C08G65/333; C08G65/33303; C08G65/3331; C08L; C08L71/00; C08L71/02; C10L1/143; C10L1/232; C10L10/00; C10L10/04; F; F02; F02B; F02B77/00; F02B77/04; F02M; F02M25/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
84 words
Compounds suitable for use as deposit control additives in internal combustion engines which comprise poly(oxyalkylene) carbamates having a C 1 -C 30 hydrocarbyloxy-terminated poly(oxyalkylene) chain of at least 5 oxyalkylene units, each unit containing 2 to 5 carbon atoms, said chain being bonded through an oxycarbonyl group to a nitrogen atom of ethylenediamine, and said poly(oxyalkylene) chain containing sufficient oxyalkylene units other than ethyleneoxy to render said compounds soluble in gasoline, and said compounds having molecular weights in the range of 500 to 10,000.
Claim 2
Dependent Claim
84 words
Compounds suitable for use as deposit control additives in internal combustion engines which comprise poly(oxyalkylene) carbamates having a C 1 -C 30 hydrocarbyloxy-terminated poly(oxyalkylene) chain of at least 5 oxyalkylene units, each unit containing 2 to 5 carbon atoms, said chain being bonded through an oxycarbonyl group to a nitrogen atom of ethylenediamine, and said poly(oxyalkylene) chain containing sufficient oxyalkylene units other than ethyleneoxy to render said compounds soluble in gasoline, and said compounds having molecular weights in the range of 500 to 10,000.
Claim 3
Dependent Claim
15 words
The compounds of claim 1 having a molecular weight of from about 1,200 to 5,000.
Claim 4
Dependent Claim
15 words
The compounds of claim 1 wherein the oxyalkylene units contain 3 or 4 carbon atoms.
Claim 5
Dependent Claim
11 words
The compounds of claim 3 wherein the oxyalkylene units are oxybutylene.
Claim 6
Dependent Claim
23 words
The compounds of claim 2 wherein the group terminating the poly(oxyalkylene) chain is a hydrocarbyloxy group containing from 2 to 20 carbon atoms.
Claim 7
Dependent Claim
11 words
The compounds of claim 4 wherein the hydrocarbyloxy group is butoxy.
Claim 8
Dependent Claim
20 words
The compounds of claim 2 wherein the hydrocarbyloxy group is an alkylphenoxy group having from 7 to 30 carbon atoms.
Claim 9
Dependent Claim
15 words
The compounds of claim 7 wherein the alkyl group in said alkylphenoxy is propylene tetramer.
Claim 10
Dependent Claim
73 words
Compounds of the formula: ##STR4## in which g is an integer 2 to 5, j is an integer such that the molecular weight of the compounds are in the range of about 1200 to about 5,000, Z is a hydrocarbyl group of 1 to 30 carbon atoms, and sufficient of the oxyalkylene units in the compounds are other than ethyleneoxy to render the compounds soluble in hydrocarbon fuels boiling in the gasoline range.
Claim 11
Dependent Claim
73 words
Compounds of the formula: ##STR4## in which g is an integer 2 to 5, j is an integer such that the molecular weight of the compounds are in the range of about 1200 to about 5,000, Z is a hydrocarbyl group of 1 to 30 carbon atoms, and sufficient of the oxyalkylene units in the compounds are other than ethyleneoxy to render the compounds soluble in hydrocarbon fuels boiling in the gasoline range.
Claim 12
Dependent Claim
9 words
Compounds of claim 9 in which g is 4.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-11-25 | 1984-05-26 | 1984-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-11-25 | 1988-05-26 | 1988-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-11-25 | 1992-05-26 | 1992-11-25 | $7700.00 | Window Closed / Lapsed |