US4094686A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Road-surface additive for preventing ice and melting snow
Assignee: VERGLIMIT TRADING Ltd A CORP OF HONG KONG
•
Filing: 1976-11-24
•
Granted: 1978-06-13
•
Expires: 1996-11-24
Abstract
Abstract An additive for admixture with road surface preparation materials to prevent formation of ice and to melt snow on the finished road surface. The additive is distributed throughout the road surface and comprises coated particles of a halide, e.g. calcium chloride, coated particles of an alkali metal hydroxide, e.g. sodium hydroxide and a trace of coated or uncoated particles of calcium hydride, the coatings being of a water-tight inert substance such as linseed oil. These coatings are worn away at the road surface by traffic to expose the particles.
Inventors
- 👤 Robert Dubois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:08
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/18; C09K3/185; E; E01; E01C; E01C11/00; E01C11/24; E01C11/245; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2993; Y10T428/2998
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
135 words
A road surface additive for incorporation in an asphalt or bituminous based road surface layer, comprising a mixture of discrete particles of a halide selected from the group consisting of calcium, magnesium and sodium chlorides and mixtures thereof and an alkali metal hydroxide selected from the group of sodium and potassium hydroxides in the ratio of 90 to 97 parts by weight of halide for 3 to 10 parts of hydroxide, said particles having substantially water-tight coatings which are inert to the halide and hydroxide and heat resistant at temperatures to which the admixed additive may be subjected for formation of a road surface layer and which coatings can be mechanically destroyed to expose said particles at the surface of a road incorporating the additive to prevent ice formation and melt snow on said surface.
Claim 2
Dependent Claim
135 words
A road surface additive for incorporation in an asphalt or bituminous based road surface layer, comprising a mixture of discrete particles of a halide selected from the group consisting of calcium, magnesium and sodium chlorides and mixtures thereof and an alkali metal hydroxide selected from the group of sodium and potassium hydroxides in the ratio of 90 to 97 parts by weight of halide for 3 to 10 parts of hydroxide, said particles having substantially water-tight coatings which are inert to the halide and hydroxide and heat resistant at temperatures to which the admixed additive may be subjected for formation of a road surface layer and which coatings can be mechanically destroyed to expose said particles at the surface of a road incorporating the additive to prevent ice formation and melt snow on said surface.
Claim 3
Dependent Claim
16 words
A road surface additive as claimed in claim 1, in which the halide is calcium chloride.
Claim 4
Dependent Claim
16 words
A road surface additive as claimed in claim 2, in which the hydroxide is sodium hydroxide.
Claim 5
Dependent Claim
29 words
A road surface additive as claimed in claim 3, in which the mixture has 15 to 24 parts by weight of calcium chloride for 1 part of sodium hydroxide.
Claim 6
Dependent Claim
18 words
A road surface additive as claimed in claim 1, in which said coatings are formed of linseed oil.
Claim 7
Dependent Claim
20 words
A road surface additive as claimed in claim 1, further comprising 0.01 to 0.15 parts by weight of calcium hydride.
Claim 8
Dependent Claim
29 words
A road surface additive as claimed in claim 6, in which said particles of calcium hydride have the same substantially water-tight coatings as the particles of halide and hydroxide.
Claim 9
Dependent Claim
49 words
A road surface additive according to claim 6, comprising 94 to 96 parts by weight of calcium chloride, 4.5 to 5.5 parts by weight of sodium hydroxide, 0.015 to 0.03 parts by weight of calcium hydride, and 2.5 to 3.5 parts by weight of linseed oil forming said coatings.
References Cited (Backward Citations)
US1371032A
Cited
GB433957A
Cited
GB510485A
Cited
US2648603A
Cited
US2979463A
Cited
US2967466A
Cited
US2978351A
Cited
US3240558A
Cited
US3310494A
Cited
US3461073A
Cited
US3507686A
Cited
US3906140A
Cited
US4012537A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |