C01B 25/2235
Anhydrite processes
Official title: {Anhydrite processes}
C01B25/2235 (Anhydrite processes) appears on 6 US grants and 0 published applications in this corpus.
Search patents in C01B- Granted patents
- 6
- Published applications
- 0
- Assignees
- 6
- Inventors
- 13
- Latest grant
- 23 Apr 1991
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1976 | 1 | 0 |
| 1977 | 0 | 0 |
| 1978 | 0 | 0 |
| 1979 | 0 | 0 |
| 1980 | 1 | 0 |
| 1981 | 1 | 0 |
| 1982 | 0 | 0 |
| 1983 | 0 | 0 |
| 1984 | 1 | 0 |
| 1985 | 1 | 0 |
| 1986 | 0 | 0 |
| 1987 | 0 | 0 |
| 1988 | 0 | 0 |
| 1989 | 0 | 0 |
| 1990 | 0 | 0 |
| 1991 | 1 | 0 |
By publication year. Applications have been published since 2001.
Recent patents
- Crystal modification in wet process phosphoric acid production23 Apr 1991US 5,009,873 ANalco Chemical Company
- Method for the wet process manufacture of phosphoric acid26 Feb 1985US 4,501,724 AGoers Associates Inc.
- Phosphoanhydrite process5 Jun 1984US 4,452,770 AUnited States Gypsum Company
- Apparatus useful for wet process phosphoric acid production7 Apr 1981US 4,260,584 AOccidental Petroleum Corporation
- Process for preventing the formation of calcium sulphate scale9 Sep 1980US 4,221,769 AFisons Limited
No published applications in this class yet.
Most cited
By later US patents
- Method of preventing gypsum scale formation in phosphoric acid plant filters12US 3,972,981 AFisons Limited · 1976
- Method for the wet process manufacture of phosphoric acid9US 4,501,724 AGoers Associates Inc. · 1985
- Crystal modification in wet process phosphoric acid production9US 5,009,873 ANalco Chemical Company · 1991
- Process for preventing the formation of calcium sulphate scale8US 4,221,769 AFisons Limited · 1980
- Apparatus useful for wet process phosphoric acid production6US 4,260,584 AOccidental Petroleum Corporation · 1981