Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
A gas detector for sensing the presence of a gaseous medium comprising: a helical coil for connection to a dc power source for generating an electromagnetic field and radiant heat; a thin-walled tubular sleeve constructed of an active sensing material having current carriers responsive to an electromagnetic field and disposed in the magnetic and heating fields of said helical coil, said helical coil surrounding said thin-walled tubular sleeve and in contact therewith, said active sensing material being capable of generating a current in response to the current carriers in the presence of a magnetic field at a predetermined temperature; and an electrode disposed in said thin-walled sleeve and in surface contact with said sleeve, so when current sensing element is connected between said electrode and one end of said coil, an electromagnetic current will be produced proportional to the concentration of the gas in contact with the outer surface of the sleeve.
Claim 2
Dependent Claim
152 words
A gas detector for sensing the presence of a gaseous medium comprising: a helical coil for connection to a dc power source for generating an electromagnetic field and radiant heat; a thin-walled tubular sleeve constructed of an active sensing material having current carriers responsive to an electromagnetic field and disposed in the magnetic and heating fields of said helical coil, said helical coil surrounding said thin-walled tubular sleeve and in contact therewith, said active sensing material being capable of generating a current in response to the current carriers in the presence of a magnetic field at a predetermined temperature; and an electrode disposed in said thin-walled sleeve and in surface contact with said sleeve, so when current sensing element is connected between said electrode and one end of said coil, an electromagnetic current will be produced proportional to the concentration of the gas in contact with the outer surface of the sleeve.
Claim 3
Dependent Claim
38 words
The gas detector as recited in claim 1 wherein said tubular sleeve is constructed of an n-type semiconductor material selected from the group consisting of zinc oxide, stannic oxide, and gallium oxide for the detection of a hydrocarbon.
Claim 4
Dependent Claim
19 words
The gas detector as recited in claim 2 wherein the operating temperature of the sleeve is between 300°-450° C.
Claim 5
Dependent Claim
29 words
The gas detector as recited in claim 1 wherein said tubular sleeve is constructed of tungsten trioxide or molybdenum trioxide mixed with silicon dioxide for the detection of hydrogen.
Claim 6
Dependent Claim
31 words
The gas detector as recited in claim 4 wherein the percentage of silicon dioxide varies from 10 to 50% by weight and the remaining is either tungsten trioxide or molybdenum trioxide.
Claim 7
Dependent Claim
23 words
The gas detector as recited in claim 5 wherein the operating temperature of the hydrogen sensor is in the range of 100°-300° C.
Claim 8
Dependent Claim
17 words
The gas detector as recited in claim 1 wherein said coil is constructed of a noble metal.
Claim 9
Dependent Claim
17 words
The gas detector as recited in claim 1 wherein said electrode is constructed of a noble metal.