US4787938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Countercurrent drum mixer asphalt plant
Assignee: Standard Havens Products Inc
•
Filing: 1986-06-30
•
Granted: 1988-11-29
•
Expires: 2006-06-30
Abstract
Abstract A drum mixer asphalt plant is provided with a rotatable cylinder 10 in which virgin aggregate, recycle material and liquid asphalt are mixed to produce an asphaltic composition and the hot gas stream for heating and drying the materials flow in countercurrent relation. In a first zone within the cylinder 10, aggregates are heated and dried by heat radiation and a hot gas stream generated at a burner head 46 of a combustion assembly 40. In a second zone within the drum cylinder 10 isolated from the burner flame and hot gas stream by the combustion assembly 40, liquid asphalt is sprayed from an injection tube 76 to mix with aggregate materials. A recycle feed assembly 60 delivers recycle asphalt material to the second zone also for mixing with the aggregate and liquid asphalt.
Inventors
- 👤 Michael R. Hawkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:29
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/02; E01C19/10; E01C19/1059; E01C19/1068; E01C19/1072; C; C08; C08L; C08L95/00; E01C19/1013; E01C19/1027; E01C19/1036; E01C2019/1081; E01C2019/109
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
128 words
A method for continuously producing an asphaltic composition from asphalt and aggregates, the steps of said method comprising: introducing aggregate material interiorly of a first end of an inclined, horizontal rotating drum to flow generally from said first end to the second end of said drum; generating a hot gas stream within said drum to flow through said drum to said first end in countercurrent relation to said aggregate material; isolating a zone of said rotating drum from said hot gas stream; delivering said heated and dried aggregate material to said zone isolated from said hot gas stream; mixing said aggregate material with liquid asphalt within said zone isolated from said hot gas stream to produce an asphaltic composition; and discharging said asphaltic composition from said rotating drum.
Claim 2
Independent Claim
128 words
A method for continuously producing an asphaltic composition from asphalt and aggregates, the steps of said method comprising: introducing aggregate material interiorly of a first end of an inclined, horizontal rotating drum to flow generally from said first end to the second end of said drum; generating a hot gas stream within said drum to flow through said drum to said first end in countercurrent relation to said aggregate material; isolating a zone of said rotating drum from said hot gas stream; delivering said heated and dried aggregate material to said zone isolated from said hot gas stream; mixing said aggregate material with liquid asphalt within said zone isolated from said hot gas stream to produce an asphaltic composition; and discharging said asphaltic composition from said rotating drum.
Claim 3
Dependent Claim
26 words
The method as set forth in claim 1, including the step of adding recycle asphalt material directly to said zone isolated from said hot gas stream.
Claim 4
Dependent Claim
36 words
The method as set forth in claim 1, including the steps of creating a curtain of falling aggregate material within said rotating drum and flowing said hot gas stream through said curtain of falling aggregate material.
Claim 5
Dependent Claim
33 words
The method as set forth in claim 1, including the step of blending a fine binder material with said liquid asphalt and aggregate material within said zone isolated from said hot gas stream.
References Cited (Backward Citations)
US30685A
Cited
US1836754A
Cited
US1774649A
Cited
US1960463A
Cited
US2448042A
Cited
US2421345A
Cited
US2487887A
Cited
US3306237A
Cited
US3423222A
Cited
US3540709A
Cited
US3788609A
Cited
US3845941A
Cited
US3975002A
Cited
US4000000A
Cited
US4106110A
Cited
US3840215A
Cited
US4183885A
Cited
US3892045A
Cited
US4256506A
Cited
US4136966A
Cited
US4182631A
Cited
US4096588A
Cited
US4189238A
Cited
US4142803A
Cited
US4153471A
Cited
US4126397A
Cited
US4104736A
Cited
US4191546A
Cited
US4130364A
Cited
US4208131A
Cited
US4219278A
Cited
US4240754A
Cited
US4326809A
Cited
US4265546A
Cited
US4238241A
Cited
US4234346A
Cited
US4298337A
Cited
US4309113A
Cited
US4387996A
Cited
US4398826A
Cited
US4382682A
Cited
US4439040A
Cited
US4480922A
Cited
US4351251A
Cited
US4481039A
Cited
US4555182A
Cited
US4477250A
Cited
US4515090A
Cited
US4600379A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-29 | 1992-05-30 | 1992-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-29 | 1996-05-30 | 1996-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-29 | 2000-05-30 | 2000-11-29 | $7700.00 | Window Closed / Lapsed |