US3986889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a mixture of bitumen and subdivided solid mineral matter
Assignee: WIBAU (WESDEUTSCHE INDUSTRIE- und STRASSENBAUMASCHINEN-GESELLSCHAFT M B H)
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Filing: 1975-05-15
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Granted: 1976-10-19
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Expires: 1995-05-15
Abstract
Abstract Method of producing a mixture of bitumen and subdivided solid mineral matter, comprising mixing pure bitumen with subdivided solid mineral matter containing moisture in at least such proportion as is picked up by the mineral matter from the atmosphere and heating the mixture to a temperature of about 120° to about 250° C.
Inventors
- 👤 Emile Muntzer
- 👤 Paul E. Muntzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:27
CPC Classifications
E; E01; E01C; E01C19/00; E01C19/02; E01C19/10; E01C19/1059; E01C19/1063; C; C08; C08L; C08L95/00; E01C19/1013; E01C7/00; E01C7/08; E01C7/18
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
126 words
A method for producing a mixture of bitumen and mineral aggregate consisting of mixing without heating cold, moist aggregate at ambient temperatures with liquid bitumen, the aggregate containing moisture at least in such proportion as is picked up by the aggregate from the atmosphere, whereby the mineral particles of finest grain size adhere to the moist mineral granules of coarser size during the mixing due to their being moist said aggregate having an upper moisture limit of about 6% by weight, and after the mixing heating the mixture to a temperature sufficient for driving off moisture from the mixture, whereby the original adhering or binding between the particles of finer grain size and the coarser mineral particles due to moisture, is replaced by a bituminous binding.
Claim 2
Independent Claim
126 words
A method for producing a mixture of bitumen and mineral aggregate consisting of mixing without heating cold, moist aggregate at ambient temperatures with liquid bitumen, the aggregate containing moisture at least in such proportion as is picked up by the aggregate from the atmosphere, whereby the mineral particles of finest grain size adhere to the moist mineral granules of coarser size during the mixing due to their being moist said aggregate having an upper moisture limit of about 6% by weight, and after the mixing heating the mixture to a temperature sufficient for driving off moisture from the mixture, whereby the original adhering or binding between the particles of finer grain size and the coarser mineral particles due to moisture, is replaced by a bituminous binding.
Claim 3
Dependent Claim
29 words
The method according to claim 1, wherein the moisture content of the aggregate is about 2 to about 6% by weight, based on the weight of the dry aggregate.
Claim 4
Dependent Claim
23 words
The method according to claim 1, wherein the proportion of bitumen is about 3 to about 10% of the weight of the aggregate.
Claim 5
Dependent Claim
18 words
The method according to claim 1 wherein the particle size of the aggregate is up to 33 mm.
Claim 6
Dependent Claim
15 words
The method according to claim 1, wherein an adhesion additive is mixed with the aggregate.
Claim 7
Dependent Claim
26 words
The method according to claim 5, wherein the proportion of the adhesion additive is about 0.01 to about 1% of the weight of the entire mixture.
Claim 8
Dependent Claim
17 words
The method according to claim 1, wherein the bitumen has a normal penetration of 40 to 300.
Claim 9
Dependent Claim
37 words
The method according to claim 1, wherein the bitumen and the aggregate are mixed together at ambient temperature, the mixture is maintained at ambient temperature without further mixing and then the mixture is subjected to said heating.
Claim 10
Dependent Claim
23 words
The method according to claim 8, wherein the mixture is maintained at ambient temperature for a period of at least about 30 minutes.
Claim 11
Dependent Claim
34 words
The method according to claim 1, wherein said heating to drive off moisture involves raising the temperature of the mineral aggregate bitumen mixture to a range of about 120° C to about 250° C.
Claim 12
Dependent Claim
57 words
The method according to claim 1, wherein said mixing of the cold, moist aggregate with the liquid bitumen is accomplished by spraying the liquid bitumen into a mixing chamber, such as a rotating mixing chamber, the rotation of which loosens the cold, moist aggregate as it is sprayed with liquid bitumen and then performing said heating step.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-19 | 1980-04-19 | 1980-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-19 | 1984-04-19 | 1984-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-19 | 1988-04-19 | 1988-10-19 | $7700.00 | Window Closed / Lapsed |