US3857552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Asphalt mixing plants for making asphalt concrete mix
Assignee: Individual
•
Filing: 1973-03-27
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Granted: 1974-12-31
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Expires: 1993-03-27
Abstract
Abstract In an asphalt mixing plant for making hot asphalt contrete mix the bituminous binder supplying means is provided with viscosity sensing means and temperature sensing means for sensing the viscosity and the temperature of the binder to be introduced into the mixer, said viscosity sensing means controlling regulating means for the heating means of the binder supplying means and said temperature sensing means controlling regulating means for the mineral aggregate supplying and heating means.
Inventors
- 👤 K Ohlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:55
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/02; E01C19/05; E01C19/10; E01C19/1059; E01C19/1068
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
153 words
In an asphalt mixing plant for making asphalt concrete mix having mineral aggregate supplying and heating means, a mixer for receiving the heated mineral aggregate, and binder supplying means including heating means for introducing heated bitumen into the mixer, the improvement comprising viscosity sensing means for sensing the viscosity of the heated binder, binder temperature regulating means for controlling the heating means of the binder supplying means, said binder temperature regulating means being operatively connected to said viscosity sensing means for controlling the temperature of the binder in relation to the viscosity of the binder, binder temperature sensing means for sensing the temperature of the binder in the binder supplying means, and aggregate temperature regulating means for the mineral aggregate supplying and heating means, said aggregate temperature regulating means being connected to said binder temperature sensing means for controlling the temperature of the mineral aggregate in relation to the temperature of the binder.
Claim 2
Dependent Claim
153 words
In an asphalt mixing plant for making asphalt concrete mix having mineral aggregate supplying and heating means, a mixer for receiving the heated mineral aggregate, and binder supplying means including heating means for introducing heated bitumen into the mixer, the improvement comprising viscosity sensing means for sensing the viscosity of the heated binder, binder temperature regulating means for controlling the heating means of the binder supplying means, said binder temperature regulating means being operatively connected to said viscosity sensing means for controlling the temperature of the binder in relation to the viscosity of the binder, binder temperature sensing means for sensing the temperature of the binder in the binder supplying means, and aggregate temperature regulating means for the mineral aggregate supplying and heating means, said aggregate temperature regulating means being connected to said binder temperature sensing means for controlling the temperature of the mineral aggregate in relation to the temperature of the binder.
Claim 3
Dependent Claim
125 words
The improvement claimed in claim 1, in which the mixing plant is arranged first to supply a coarse fraction of mineral aggregate and the binder to the mixer and to mix them, before a more fine-grained and residual fraction of the mineral aggregate is introduced into the mixer under continued mixing, wherein means forming part of the supplying and heating means for the aggregate and determining the temperature at which the coarse fraction of the aggregate and the more fine-grained fraction of the aggregate, respectively, is supplied to the mixer, are provided each with regulating means individually controllable by the binder temperature sensing means to permit supplying the coarse aggregate fraction to the mixer at a temperature other than that of the more fine-grained fraction.
Claim 4
Dependent Claim
66 words
The improvement claimed in claim 1 in which the supplying and heating means for the mineral aggregate are controlled by means of one or more adjustable thermostats adapted in said asphalt plant to sense one or more temperatures determinative of the temperature of the mineral aggregate as it arrives in the mixer, wherein the binder temperature sensing means are adapted to adjust the thermostat or thermostats.
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) | 1977-12-30 | 1978-07-01 | 1978-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-30 | 1982-07-01 | 1982-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-30 | 1986-07-01 | 1986-12-31 | $7700.00 | Window Closed / Lapsed |