US5290768A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Welan gum-ethylene glycol insulating compositions
Assignee: CP Kelco US Inc
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Filing: 1991-01-18
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Granted: 1994-03-01
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Expires: 2011-01-18
Abstract
Abstract An ethylene glycol composition containing a glycol-compatible welan gum having unique viscosity and thermal properties. The composition is especially suitable as an insulation material.
Inventors
- 👤 A. Michael Ramsay
- 👤 Gail Trimble
- 👤 James M. Seheult
- 👤 Michael S. O'Brien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:14
CPC Classifications
C; C08; C08L; C08L19/00; H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; C08L5/00; C09; C09K; C09K5/00; C09K5/08; C09K5/10; E; E21; E21B; E21B17/00; E21B17/01; E21B43/00; E21B43/01; F; F16; F16L; F16L59/00; F16L59/14; F16L59/143
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
50 words
A thixotropic composition consisting essentially of ethylene glycol, a chelating agent, and glycol-compatible welan gum, wherein the glycol-compatible welan gum, in a 0.25% mixture with ethylene glycol, measured at 6 rpm with a Brookfield LVT, at room temperature and cylindrical spindle #4, has a viscosity greater than about 2,500 cP.
Claim 2
Dependent Claim
50 words
A thixotropic composition consisting essentially of ethylene glycol, a chelating agent, and glycol-compatible welan gum, wherein the glycol-compatible welan gum, in a 0.25% mixture with ethylene glycol, measured at 6 rpm with a Brookfield LVT, at room temperature and cylindrical spindle #4, has a viscosity greater than about 2,500 cP.
Claim 3
Dependent Claim
24 words
A composition of claim 1 wherein the glycol and glycol-compatible welan gum are present in a weight ratio of between about 100:1 and 300:1.
Claim 4
Dependent Claim
14 words
A composition of claim 2 wherein the ratio is between about 150:1 and 250:1.
Claim 5
Dependent Claim
14 words
A composition of claim 3 wherein the ratio is between about 175:1 and 225:1.
Claim 6
Dependent Claim
14 words
A composition of claim 4 wherein the ratio is between about 180:1 and 220:1.
Claim 7
Dependent Claim
11 words
A composition of claim 5 wherein the ratio is about 195:1.
Claim 8
Dependent Claim
23 words
A composition of claim 1 wherein the chelating agent is EDTA present in an amount of between about 500 ppm and 2000 ppm.
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) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |