US3792907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for removing asphalt topping from pavement substrate
Assignee: Gas Technology Institute
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Filing: 1972-04-10
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Granted: 1974-02-19
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Expires: 1992-04-10
Abstract
Abstract The invention relates to a method of hydraulically separating asphalt topping from pavement substrate, as opposed to mechanically tearing the bond between the two layers of material. This method results in significantly less damage to the pavement substrate, and is accomplished with the use of a high velocity water jet. The method is unlike erosion of a surface by water in that once an initial erosion cut is made, the asphalt topping and the pavement substrate is separated by debonding.
Inventors
- 👤 P Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:44
CPC Classifications
E; E01; E01C; E01C23/00; E01C23/06; E01C23/12; E01C23/128; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1052; Y10T156/1082; Y10T156/19; Y10T156/1961; Y10T156/1967; Y10T156/1972
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
115 words
A low noise process for removing asphalt topping from pavement substrate comprising the steps of: forming a slit in the asphalt topping to the depth of the interface between the asphalt topping and the pavement substrate; debonding the asphalt topping on both sides of the slit by pressurizing the interface between the asphalt topping and the pavement substrate with a fluid to a value which exceeds the strength of the bond between the asphalt topping and the pavement substrate so that the fluid spreads out on both sides of the slit formed in the asphalt topping and separates the asphalt topping from the pavement substrate; and removing the debonded asphalt topping from the pavement substrate.
Claim 2
Dependent Claim
115 words
A low noise process for removing asphalt topping from pavement substrate comprising the steps of: forming a slit in the asphalt topping to the depth of the interface between the asphalt topping and the pavement substrate; debonding the asphalt topping on both sides of the slit by pressurizing the interface between the asphalt topping and the pavement substrate with a fluid to a value which exceeds the strength of the bond between the asphalt topping and the pavement substrate so that the fluid spreads out on both sides of the slit formed in the asphalt topping and separates the asphalt topping from the pavement substrate; and removing the debonded asphalt topping from the pavement substrate.
Claim 3
Dependent Claim
23 words
The process of claim 1, including forming the slit in the asphalt topping by erosion cutting the asphalt topping with a water jet.
Claim 4
Dependent Claim
53 words
The process of claim 1, including the step of delineating an area in which the asphalt topping is to be removed by forming a slit in the asphalt topping by erosion cutting the asphalt topping to the depth of the interface between the asphalt topping and the pavement substrate with a water jet.
Claim 5
Dependent Claim
32 words
The process of cLaim 1, including the steps of forming a plurality of parallel slits in the asphalt topping, and debonding the asphalt topping on both sides of each of the slits.
Claim 6
Dependent Claim
20 words
The process of claim 4, including spacing the parallel slits such that the debonding from each adjacent slit will overlap.
Claim 7
Dependent Claim
18 words
The process of claim 1, the debonding of the asphalt being accomplished by use of pulses of fluid.
Claim 8
Dependent Claim
18 words
The process of claim 1, the debonding of the asphalt being accomplished with a continuous stream of fluid.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |