US3753620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
In-situ treatment of roadway
Assignee: CONVERSION SYSTEMS OF PENNSYLVANIA Inc
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Filing: 1971-06-07
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Granted: 1973-08-21
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Expires: 1991-06-07
Abstract
Abstract A new bituminous coal fly ash is sulfopozzolanically reactive and contains combined sulfate in stated proportions relative to alkaline earth metal oxide content. Load-supporting compositions of this fly ash combined with aggregate, and a method of applying the new fly ash to an existing surface.
Inventors
- 👤 L Minnick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:37
CPC Classifications
C; C04; C04B; C04B18/00; C04B18/04; C04B18/06; C04B18/08; C04B28/00; C04B28/18; E; E01; E01C; E01C3/00; E01C3/003; E01C3/04; C04B2111/00; C04B2111/00474; C04B2111/0075; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
53 words
The method defined in claim 1, wherein the existing surface is soil, and wherein said soil is broken up and wherein the fly ash is mixed with the soil, said soil comprising at least part of said aggregate, and the mixture is compacted just after it has been applied over said existing surface.
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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |