US2528103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing sulfuric acid and hydraulic cement from gypsum
Assignee: Individual
•
Filing: 1946-01-07
•
Granted: 1950-10-31
•
Expires: 1966-01-07
Abstract
No abstract record available.
Inventors
- 👤 Robert M Willson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:26
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/69; C01B17/74; C01B17/745; C04; C04B; C04B7/00; C04B7/02; C04B7/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A METHOD OF MAKING SULPHURIC ACID WHICH CONSISTS IN PREPARING FINELY GROUND ACID-WASHED ARGILLACEOUS MATERIALS, MIXING THE SAME WITH FINELY GROUND GYPSUM IN PROPORTIONS TO PRODUCE CEMENT CLINKER, SUBJECTING THE MIXTURE TO HEAT IN AN OXIDIZING ATMOSPHERE UNTIL THE PARTICLE SIZE IS MATERIALLY REDUCED AND A CLINKER IS FORMED, THEREAFTER ADDING CARBONACEOUS MATERIAL CONTAINING A CATALYZING MATERIAL CONSISTING OF THE MINERAL COMPONENTS PRESENT IN COAL AND COAL ASH TO SAID CLINKER, REGRINDING THIS MIXTURE, SUBJECTING THIS MIXTURE TO HEAT IN AN OXIDIZING ATMOSHERE TO PRODUCE A CEMENT CLINKER AND TO FREE SULPHUR OXIDE GASES SUBSTANTAILLY IN THE FORM OF SULFUR TRIOXIDE AND TREATING THE GASES TO FORM SULPHURIC ACID.
Claim 2
Independent Claim
109 words
A METHOD OF MAKING SULPHURIC ACID WHICH CONSISTS IN PREPARING FINELY GROUND ACID-WASHED ARGILLACEOUS MATERIALS, MIXING THE SAME WITH FINELY GROUND GYPSUM IN PROPORTIONS TO PRODUCE CEMENT CLINKER, SUBJECTING THE MIXTURE TO HEAT IN AN OXIDIZING ATMOSPHERE UNTIL THE PARTICLE SIZE IS MATERIALLY REDUCED AND A CLINKER IS FORMED, THEREAFTER ADDING CARBONACEOUS MATERIAL CONTAINING A CATALYZING MATERIAL CONSISTING OF THE MINERAL COMPONENTS PRESENT IN COAL AND COAL ASH TO SAID CLINKER, REGRINDING THIS MIXTURE, SUBJECTING THIS MIXTURE TO HEAT IN AN OXIDIZING ATMOSHERE TO PRODUCE A CEMENT CLINKER AND TO FREE SULPHUR OXIDE GASES SUBSTANTAILLY IN THE FORM OF SULFUR TRIOXIDE AND TREATING THE GASES TO FORM SULPHURIC ACID.
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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) | 1953-10-30 | 1954-05-01 | 1954-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-10-30 | 1958-05-01 | 1958-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-10-30 | 1962-05-01 | 1962-10-31 | $7700.00 | Window Closed / Lapsed |