| 281 |
Method and apparatus for purifying potassium salt-containing materials |
US7907360 |
1960-12-28 |
US3096034A |
1963-07-02 |
KURT SCHMIDLAPP |
|
| 282 |
Heavy media separation of porous material |
US67670657 |
1957-08-07 |
US2991878A |
1961-07-11 |
GARY WRIGHT W; DUKE JAMES B |
|
| 283 |
Drying method |
US37777953 |
1953-09-01 |
US2847123A |
1958-08-12 |
LAWVER JAMES E |
|
| 284 |
Process for fractionating mixtures of solid particles of different porosities |
US50910055 |
1955-05-17 |
US2832470A |
1958-04-29 |
KORNELIS RIETEMA |
|
| 285 |
Method and apparatus for recovering valuable minerals |
US26663552 |
1952-01-16 |
US2801003A |
1957-07-30 |
MORRISON ROBERT P |
|
| 286 |
Separation of gel particles |
US29578952 |
1952-06-26 |
US2718305A |
1955-09-20 |
WEISZ PAUL B |
|
| 287 |
Method and apparatus for demagnetizing magnetic ores having high coercive force |
US16507650 |
1950-05-29 |
US2678130A |
1954-05-11 |
ONSTAD NORDAHL L; FOOT NORMAN J |
|
| 288 |
Separation of preferred fractions from apparently homogeneous gel particles |
US63711345 |
1945-12-22 |
US2508867A |
1950-05-23 |
RAMPINO LOUIS D |
|
| 289 |
Method for separating worm-damaged nuts from sound nuts by immersion in a gravity liquid |
US49252443 |
1943-06-28 |
US2451528A |
1948-10-19 |
ARMSTRONG JAMES A |
|
| 290 |
Separation of mercury by hydraulic concentration and screening |
US55740144 |
1944-10-06 |
US2439694A |
1948-04-13 |
ROBERTSON HARRY M |
|
| 291 |
Asbestos dusting process and apparatus |
US48069943 |
1943-03-26 |
US2420495A |
1947-05-13 |
PHARO LEE C |
|
| 292 |
Concentrating of chromium-bearing ores |
US24469738 |
1938-12-08 |
US2256536A |
1941-09-23 |
UDY MARVIN J |
|
| 293 |
Vermiculite expansion method |
US18165837 |
1937-12-24 |
US2139378A |
1938-12-06 |
MYERS JOHN B; GLENN SUCETTI |
|
| 294 |
Method and means for separating seeds |
US56096231 |
1931-09-03 |
US2031943A |
1936-02-25 |
CHARLES DYER FREDERICK; LANGDON MCCLELLAND HAROLD |
|
| 295 |
Process for concentrating ores and other mineral aggregates |
US40956229 |
1929-11-25 |
US1921306A |
1933-08-08 |
ALDRICH JR TRUMAN H |
|
| 296 |
Process of dressing coal |
US46922930 |
1930-07-19 |
US1854659A |
1932-04-19 |
KARL LEHMANN |
|
| 297 |
Separating process and apparatus |
US45238630 |
1930-05-14 |
US1845366A |
1932-02-16 |
TILLER DAVID M |
|
| 298 |
Apparatus for removing dust from stone crushing and segregating apparatus |
US16703627 |
1927-02-09 |
US1699180A |
1929-01-15 |
COLGAN FRANK J |
|
| 299 |
Process of treating minerals |
US3852525 |
1925-06-20 |
US1586365A |
1926-05-25 |
BERKELEY HIGGINS ERIC |
|
| 300 |
Method of separating and purifying minerals |
US52432321 |
1921-12-22 |
US1489008A |
1924-04-01 |
COURCY RICHARDS HARRY DE |
|
