US3201268A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of clay soils and aggregates with lead salts of phosphoric and sulfuric acids
Assignee: Dow Chemical Co
•
Filing: 1962-06-21
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Granted: 1965-08-17
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Expires: 1982-06-21
Abstract
No abstract record available.
Inventors
- 👤 John B Hemwall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:43
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/131; Y; Y10; Y10S; Y10S106/00; Y10S106/90
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A MIXTURE OF AN ARGILLACEOUS SOIL HAVING AT LEAST 15 WEIGHT PERCENT CLAY AND NOT MORE THAN 50 PERCENT SAND WITH A WATER-SOLUBLE LEAD SALT AND ACID OF THE GROUP CONSISTING OF PHOSPHORIC ACID AND ITS MIXTURE WITH SULFURIC ACID, SAID SOIL MIXTURE HAVING A PROPORTION OF FROM 0.1 TO 5 WEIGHT PERCENT OF PHOSPHORUS AS PHOSPHORIC ACID ON A DRY SOIL WEIGHT BASIS, FROM 0.05 TO 0.5 MOLAR PROPORTIONS OF CAD PER MOLE OF H3PO4 AND 0 TO 3.5 MOLES H2SO4.
References Cited (Backward Citations)
US2072212A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-08-16 | 1969-02-15 | 1969-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-08-16 | 1973-02-15 | 1973-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-08-16 | 1977-02-15 | 1977-08-17 | $7700.00 | Window Closed / Lapsed |