Glenn A Atwood

US Patent:

40877981, May 2, 1978

Filed:

Mar 17, 1976

Appl. No.:

5/667821

Inventors:

Donald C. Thorn - Akron OH
Glenn A. Atwood - Akron OH

Assignee:

The University of Akron - Akron OH

International Classification:

G08B 1710
G01R 2704
H01P 706

US Classification:

340237R

Abstract:

A spectroscopic refractometer has a plurality of resonant cavities through which the environment to be sampled may pass, including a first resonant cavity constructed and tuned to resonate at a transition frequency of the resonant material of interest and a second resonant cavity constructed and tuned to resonate at a nontransition frequency closely associated to the transition frequency to which the first resonant cavity is tuned. The resonant cavities are excited by electromagnetic oscillations corresponding in frequency to the transition and the nontransition frequency. A corrrelating parameter, such as frequency difference, is determined between the signals within the first and second resonant cavities, which in the absence of the resonant material of interest has a constant value. In the presence of the resonant material of interest a change in the value of the correlating parameter is detected and subsequently compared with the constant value of the correlating parameter so as to determine the presence of the resonant material of interest.

US Patent:

52175030, Jun 8, 1993

Filed:

Mar 18, 1991

Appl. No.:

7/670892

Inventors:

Henry H. Leehe - Plainville IN
Glenn A. Atwood - Akron OH

Assignee:

Midwest Ore Processing Company, Inc. - Plainville IN

International Classification:

C10L 900
C10L 906
C10L 902

US Classification:

44620

Abstract:

An additional step directed to the Starbuck process of desulfurizing coal and ores, as described and claimed in reissue patent No. RE. 32,454 dated Jul. 7, 1987, including the treatment of non-weathered coal ore to simulate weathered coal ore. Several approaches are presented which result in increased sulfur removal and increased pyrite removal.