US4012537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
De-icing compositions contained in road surface material
Assignee: VERGLIMIT TRADING Ltd A CORP OF HONG KONG
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Filing: 1974-06-07
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Granted: 1977-03-15
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Expires: 1994-06-07
Abstract
Abstract A composition for admixture with road surface preparation materials to prevent formation of ice and to melt snow on the finished road surface. The composition is distributed throughout the road surface and comprises particulate thawing substances at least some of which have a watertight coating resistant to the thawing substance and to the temperature at which the composition materials are prepared for application as a road surface. The coating may, however, be worn away by mechanical action, e.g. traffic movement, to expose the thawing substance.
Inventors
- 👤 Robert Dubois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:53
CPC Classifications
E; E01; E01H; E01H10/00; C; C09; C09K; C09K3/00; C09K3/18; C09K3/185; E01C; E01C11/00; E01C11/24; E01C11/245; E01C7/00; E01C7/08; E01C7/18; E01C7/182; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
70 words
An asphalt or bituminous based road surfacing material having dispersed therein 2 to 7% by weight of an ice-prevention and snow-thawing mixture of discrete particles of a calcium halide and an alkali metal hydroxide in the ratio of 15 to 20 parts by weight of halide for 1 part of hydroxide, said particles having a substantially water-tight coating which can be mechanically destroyed to expose said particles of the mixture.
Claim 2
Dependent Claim
70 words
An asphalt or bituminous based road surfacing material having dispersed therein 2 to 7% by weight of an ice-prevention and snow-thawing mixture of discrete particles of a calcium halide and an alkali metal hydroxide in the ratio of 15 to 20 parts by weight of halide for 1 part of hydroxide, said particles having a substantially water-tight coating which can be mechanically destroyed to expose said particles of the mixture.
Claim 3
Dependent Claim
28 words
A road surfacing material according to claim 1 in which the mixture is of between 15 to 20 parts of calcium chloride for 1 part of sodium hydroxide.
Claim 4
Dependent Claim
26 words
A road surfacing material according to claim 1 in which the mixture contains a trace quantity of particles of a substance which causes dissociation of water.
Claim 5
Dependent Claim
15 words
A road surfacing material according to claim 3 in which said substance is calcium hydride.
Claim 6
Dependent Claim
40 words
A road surfacing material according to claim 4, in which said mixture consists of between 15 to 20 parts by weight of calcium chloride, 1 part by weight of sodium hydroxide and approximately 0.04 parts by weight of calcium hydride.
Claim 7
Dependent Claim
31 words
A road surfacing material according to claim 5, in which said particles of calcium chloride and sodium hydroxide are coated with linseed oil, and said particles of calcium hydride are uncoated.
Claim 8
Dependent Claim
55 words
A road surfacing material according to claim 5, in which said particles of calcium chloride and sodium hydroxide are coated with a synthetic material selected from vinyl acetates polyvinyl alcohol, epoxy resin, acrylic resin and a mineral oil derivative which does not attack said road surfacing material, and said particles of calcium hydride are uncoated.
Claim 9
Dependent Claim
29 words
A method for preventing ice formation and for removing snow on a road surface, comprising preparing the road surface from a road surfacing material as claimed in claim 1.
References Cited (Backward Citations)
US1371032A
Cited
GB433957A
Cited
US2648603A
Cited
US2979463A
Cited
US2967466A
Cited
US2978351A
Cited
US3240558A
Cited
US3310494A
Cited
US3461073A
Cited
US3507686A
Cited
US3855167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-14 | 1980-09-13 | 1981-03-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-14 | 1984-09-13 | 1985-03-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-14 | 1988-09-13 | 1989-03-15 | $7700.00 | Window Closed / Lapsed |