| Patent Number |
Title Of Patent |
Date Issued |
| 4906130 |
Anti-scouring device for a dam stilling basin or approach |
March 6, 1990 |
| An anti-scouring device for preventing scouring of the bed of a flowing stream at an upstream or downstream location proximate a dam has a plurality of rows of concrete members, positioned in the direction of flow of the stream, on the bed of the stream. The concrete members have a base |
| 4881848 |
Method of forming an immersed dam foundation and a dam structure thereon |
November 21, 1989 |
| An immersed dam foundation and a dam structure are formed in a body of moving water by forming a plurality of spaced piers having temporary support posts thereon. A current deflector is secured to the upstream support posts and sheet piling walls are driven to form upstream and downs |
| 4865820 |
Gas mixer and distributor for reactor |
September 12, 1989 |
| A gas mixer and distributor for a reactor has first and second inlet chambers with the second inlet chamber being interposed between the first inlet chamber and an entrance to a reaction chamber. Walls form tubular or slit-like passageways extending from the first chamber to the entrance |
| 4503018 |
Desulfurization of phosphogypsum |
March 5, 1985 |
| Phosphogypsum is mixed with fine coal, balled, and charged to a travelling grate where the charge is heated under reducing conditions to evolve sulfur and/or sulfur dioxide for conversion into sulfuric acid. |
| 4402923 |
Process for making phosphoric acid |
September 6, 1983 |
| A phosphate rock slurry, which may be used in the production of wet process phosphoric acid, is provided by wet grinding the rock with partially neutralized, acid water.In one aspect, wet process phosphoric acid is made by advantageously recycling mineral acid waste water effluent of the |
| 4293390 |
Apparatus for treatment of hydrocarbon-containing mineral material |
October 6, 1981 |
| Process and apparatus are disclosed for recovering liquid and gaseous fuel from solid hydrocarbon-containing mineral material such as bitumen-containing mineral materials exemplified by tar sands or oil-bearing diatomites, without expensive pretreatment to separate the hydrocarbon co |
| 4261692 |
Roll press for forming briquettes |
April 14, 1981 |
| A roll press includes two coacting rolls arranged to form briquettes by engagement of coacting surfaces having suitable depressions formed therein. Each of the rolls includes a central arbor of polygonal cross section including a plurality of flat faces each having a dovetail slot th |
