US4668416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion inhibition of road deicing
Assignee: Georgia-Pacific LLC
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Filing: 1986-05-16
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Granted: 1987-05-26
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Expires: 2006-05-16
Abstract
Abstract A process of making a deicing or dust control agent with reduced corrosivity comprises mixing spent sulfite liquor and chloride salt of an alkali metal or alkaline earth metal proportionally so that the ratio of lignosulfonate solids of the spent sulfite liquor to metal chloride salt is from about 1:25 to about 15:1 and the pH of the mixture is from about 4.5 to about 8.5. The sulfite liquor: chloride salt product can be spread onto road surfaces in dried form, sprayed on as single or multiple solutions, and/or mixed with a non-slipping agent or the like.
Inventors
- 👤 John A. Neal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:19
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/22; C09K3/18; C09K3/185
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
89 words
A process for deicing a roadway surface with low corrosion of roadway metals comprising adding to a snow or ice covered roadway surface an effective amount of a composition consisting essentially of a lignosulfonate and metal chloride salt mixture having a ratio (dry weight) of the lignosulfonate to the metal chloride salt from about 1:15 to about 2:1, said mixture having a pH of from about 4.5 to about 8.5, wherein said metal chloride salt is selected from the group consisting of alkali metal and alkaline earth metal chlorides.
Claim 2
Dependent Claim
89 words
A process for deicing a roadway surface with low corrosion of roadway metals comprising adding to a snow or ice covered roadway surface an effective amount of a composition consisting essentially of a lignosulfonate and metal chloride salt mixture having a ratio (dry weight) of the lignosulfonate to the metal chloride salt from about 1:15 to about 2:1, said mixture having a pH of from about 4.5 to about 8.5, wherein said metal chloride salt is selected from the group consisting of alkali metal and alkaline earth metal chlorides.
Claim 3
Dependent Claim
16 words
The process of claim 1 wherein said lignosulfonate and said salt are added in dry form.
Claim 4
Dependent Claim
28 words
The process of claim 1 wherein said lignosulfonate comprises a spent sulfite liquor and said sulfite liquor and said salt are added to the roadway surface in solution.
Claim 5
Dependent Claim
15 words
The process of claim 1 wherein a non-slipping agent is also present in the mixture.
Claim 6
Dependent Claim
18 words
The process of claim 1 to control ice wherein said ratio is from about 1:8 to about 3:2.
Claim 7
Dependent Claim
17 words
The process of claim 1 wherein the pH of the mixture is from about 5 to 8.
Claim 8
Dependent Claim
12 words
The process of claim 1 wherein the metal chloride is sodium chloride.
Claim 9
Dependent Claim
12 words
The process of claim 1 wherein the metal chloride is magnesium chloride.
Claim 10
Dependent Claim
15 words
The process of claim 1 wherein the lignosulfonate comprises a fermented calcium spent sulfite liquor.
Claim 11
Dependent Claim
20 words
The process of claim 1 wherein the lignosulfonate comprises a sodium spent sulfite liquor as obtained from the sulfite process.
Claim 12
Dependent Claim
56 words
A deicing composition with reduced corrosivity for roadway metals consisting essentially of a mixture of a lignosulfonate and an alkali metal chloride salt having a ratio (dry weight) of the lignosulfonate to the alkali metal chloride salt of from about 1:25 to about 15:1, said mixture having a pH of from about 4.5 to about 8.5.
Claim 13
Dependent Claim
56 words
A deicing composition with reduced corrosivity for roadway metals consisting essentially of a mixture of a lignosulfonate and an alkali metal chloride salt having a ratio (dry weight) of the lignosulfonate to the alkali metal chloride salt of from about 1:25 to about 15:1, said mixture having a pH of from about 4.5 to about 8.5.
Claim 14
Dependent Claim
35 words
The deicing composition of claim 11 wherein said alkali metal chloride salt is sodium chloride and wherein said ratio (dry weight) of the lignosulfonate to the sodium chloride is from about 1:15 to about 2:1.
Claim 15
Dependent Claim
75 words
A deicing composition with reduced corrosivity for roadway metals consisting essentially of a combination of a lignosulfonate and an alkali metal chloride and alkaline earth metal chloride salt mixture having a ratio (dry weight) of the lignosulfonate to the salt mixture of from about 1:25 to about 15:1, the combination of lignosulfonate and the salt mixture of alkali metal chloride and alkaline earth metal chloride having a pH of from about 4.5 to about 8.5.
Claim 16
Dependent Claim
75 words
A deicing composition with reduced corrosivity for roadway metals consisting essentially of a combination of a lignosulfonate and an alkali metal chloride and alkaline earth metal chloride salt mixture having a ratio (dry weight) of the lignosulfonate to the salt mixture of from about 1:25 to about 15:1, the combination of lignosulfonate and the salt mixture of alkali metal chloride and alkaline earth metal chloride having a pH of from about 4.5 to about 8.5.
Claim 17
Dependent Claim
45 words
The deicing composition of claim 13 wherein said alkali metal chloride is sodium chloride, said alkaline earth metal chloride is magnesium chloride, and said ratio of the lignosulfonate to the salt mixture of sodium chloride and magnesium chloride is from about 1:15 to about 2:1.
Claim 18
Dependent Claim
16 words
The deicing composition of claim 12 wherein said ratio is from about 1:8 to about 3:2.
Claim 19
Dependent Claim
16 words
The deicing composition of claim 14 wherein said ratio is from about 1:8 to about 3:2.
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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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |