US6235069B1
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ethylene-vinyl formate copolymers, process for their preparation, their use as flow improvers, and fuel and propellant compositions comprising them
Assignee: BASF SE
•
Filing: 2000-05-24
•
Granted: 2001-05-22
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Expires: 2020-05-24
Abstract
Abstract Copolymer comprising ethylene units and vinyl formate units, the content of free vinyl formate in the polymer preferably being not more than 5000 ppm, based on the weight of the copolymer, a process for its preparation, and its use as flow improver, especially in petroleum distillates, preferably fuel and propellant compositions, especially petroleum middle distillates, and also a fuel and propellant composition comprising a principal quantity of a fuel and propellant and that quantity of a copolymer as above which is effective in improving the flow properties.
Inventors
- 👤 Andreas Deckers
- 👤 Bernd Wenderoth
- 👤 Thomas Rühl
- 👤 Hans-Joachim Müller
- 👤 Roger Klimesch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:55
CPC Classifications
C; C10; C10L; C10L1/00; C10L1/10; C10L1/14; C10L1/18; C10L1/192; C10L1/195; C10L1/197; C10L1/1973; C08; C08F; C08F210/00; C08F210/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
23 words
A composition comprising a petroleum middle distillate and a copolymer consisting of ethylene units and vinyl formate units as the sole flow improver.
Claim 2
Dependent Claim
23 words
A composition comprising a petroleum middle distillate and a copolymer consisting of ethylene units and vinyl formate units as the sole flow improver.
Claim 3
Dependent Claim
31 words
A composition as claimed in claim 1 , comprising a petroleum middle distillate and from 0.01 to 0.1% by weight, of the copolymer, based on the overall weight of the composition.
Claim 4
Dependent Claim
29 words
The composition of claim 1 , wherein the amount of free vinyl formate in the copolymer is not more than 5000 ppm based on the weight of the copolymer.
Claim 5
Dependent Claim
27 words
The composition of claim 1 , wherein the amount of vinyl formate units in the copolymer is from 10 ppm to 50% by weight of the copolymer.
Claim 6
Dependent Claim
27 words
The composition of claim 1 , wherein the amount of vinyl formate units in the copolymer is from 20 ppm to 35% by weight of the copolymer.
Claim 7
Dependent Claim
24 words
The composition of claim 1 , wherein the petroleum middle distillate is a member selected from the group consisting of fuel and propellant compositions.
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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) | 2004-05-21 | 2004-11-20 | 2005-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-05-21 | 2008-11-20 | 2009-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-05-21 | 2012-11-20 | 2013-05-22 | $7700.00 | Window Closed / Lapsed |