US4322167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making asphalt-rubber pavement compositions
Assignee: Individual
•
Filing: 1980-02-14
•
Granted: 1982-03-30
•
Expires: 2000-02-14
Abstract
Abstract A method and apparatus for mixing molten asphalt and granulated rubber including an asphalt input system and a rubber input system for delivering the molten asphalt and the granulated rubber in accordance with predetermined mixture proportions to a two-stage mixing system which mixes those materials to form a consistantly formululated thoroughly blended asphalt-rubber composition.
Inventors
- 👤 Francis K. Hill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:36
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/45; E01C19/02; E01C19/10; E01C19/1059; E01C19/1068; B; B29; B29K; B29K2021/00; B29K2095/00
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
117 words
A method for mixing molten asphalt and granulated rubber comprising the steps of: (a) supplying molten asphalt to a mixing means at a variably controllable flow rate; (b) supplying granulated rubber to said mixing means at a known constant feed rate; (c) mixing the supplied molten asphalt and the supplied granulated rubber in said mixing means to produce a premixed asphalt-rubber composition; (d) extracting the premixed asphalt-rubber composition from said mixing means at a variably controllable flow rate; (e) directing the extracted premixed asphalt-rubber composition under pressure through an in-line motionless mixer for producing a thoroughly blended asphalt-rubber composition; and (f) delivering the thoroughly blended asphalt-rubber composition from said in-line motionless mixer to a point of use.
Claim 2
Independent Claim
117 words
A method for mixing molten asphalt and granulated rubber comprising the steps of: (a) supplying molten asphalt to a mixing means at a variably controllable flow rate; (b) supplying granulated rubber to said mixing means at a known constant feed rate; (c) mixing the supplied molten asphalt and the supplied granulated rubber in said mixing means to produce a premixed asphalt-rubber composition; (d) extracting the premixed asphalt-rubber composition from said mixing means at a variably controllable flow rate; (e) directing the extracted premixed asphalt-rubber composition under pressure through an in-line motionless mixer for producing a thoroughly blended asphalt-rubber composition; and (f) delivering the thoroughly blended asphalt-rubber composition from said in-line motionless mixer to a point of use.
Claim 3
Dependent Claim
25 words
The method of claim 1 wherein the step of supplying the granulated rubber to said mixing means is accomplished at a fixed constant feed rate.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein the step of supplying the granulated rubber to said mixing means is accomplished at a variably controllable constant feed rate.
Claim 5
Dependent Claim
112 words
The method of claim 1 wherein the step of supplying the granulated rubber to said mixing means includes the steps of: (a) operating a materials feeding blower means to produce a negative static pressure therein; (b) coupling the negative static pressure produced by said materials feeding blower means to a bulk supply of the granulated rubber to draw the granulated rubber to said materials feeding blower means; (c) delivering the granulated rubber under pressure from said materials feeding blower means to a cyclone; and (d) delivering the granulated rubber from said cyclone to a rubber feeding means for supplying the granulated rubber to said mixing means at the known constant feed rate.
References Cited (Backward Citations)
US881940A
Cited
US1613682A
Cited
GB880481A
Cited
US3451659A
Cited
US3625724A
Cited
US3682448A
Cited
US3610588A
Cited
NL7712041A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-03-29 | 1985-09-28 | 1986-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-29 | 1989-09-28 | 1990-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-29 | 1993-09-28 | 1994-03-30 | $7700.00 | Window Closed / Lapsed |