Patent US4588640A successfully refreshed from Google Patents.
US4588640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Particulate compositions
Assignee: Baker Petrolite LLC
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Filing: 1984-07-10
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Granted: 1986-05-13
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Expires: 2004-07-10
Abstract
Abstract The invention pertains to particulate compositions comprising a mixture of a low melting point petroleum additive and a higher melting point polymer which mixture is then coated with a high melting point polymer. The mixture of the additive and higher melting point polymer has a melting point close to the melting point of the polymer (i.e., significantly higher than the melting point of the additive). The high melting point polymer coating allows the composition to be added to petroleum systems having high temperatures without immediately dissolving, i.e., the compositions are only slowly soluble in hot crude oil. Accordingly, a slow, controlled release is afforded by the compositions of the invention.
Inventors
- 👤 William J. Matlach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:59
CPC Classifications
C; C10; C10M; C10M177/00; C08; C08F; C08F8/00; C08F8/14; C10L; C10L1/00; C10L1/10; C10L1/14; Y; Y10; Y10S; Y10S525/00; Y10S525/902; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2984; Y10T428/2985; Y10T428/2991; Y10T428/2998; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31928
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
86 words
In a solid, particulate composition of matter comprising a solid mixture of a chemical additive for petroleum systems said additive being a low molecular weight polymer or mixture or polymers containing side chains of at least 12 carbon atoms and an essentially hydrocarbon soluble polymer compatible therewith said mixture having a melting point of above about 50° C. to about 150° C., the improvement which comprises an encapsulating coating on said solid mixture of a high melting point, essentially hydrocarbon insoluble polymer compatible with said mixture.
Claim 2
Dependent Claim
86 words
In a solid, particulate composition of matter comprising a solid mixture of a chemical additive for petroleum systems said additive being a low molecular weight polymer or mixture or polymers containing side chains of at least 12 carbon atoms and an essentially hydrocarbon soluble polymer compatible therewith said mixture having a melting point of above about 50° C. to about 150° C., the improvement which comprises an encapsulating coating on said solid mixture of a high melting point, essentially hydrocarbon insoluble polymer compatible with said mixture.
Claim 3
Dependent Claim
13 words
Composition of claim 1 wherein said additive is a pour point depressant compound.
Claim 4
Dependent Claim
12 words
Composition of claim 1 wherein said additive is a paraffin inhibitor compound.
Claim 5
Dependent Claim
11 words
Composition of claim 1 wherein said additive is a flow improver.
Claim 6
Dependent Claim
11 words
Composition of claim 1 wherein said hydrocarbon soluble polymer is polyethylene.
Claim 7
Dependent Claim
13 words
Composition of claim 1 wherein said hydrocarbon insoluble polymer is an acrylic polymer.
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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) | 1989-05-12 | 1989-11-11 | 1990-05-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-12 | 1993-11-11 | 1994-05-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-12 | 1997-11-11 | 1998-05-13 | $7700.00 | Window Closed / Lapsed |