Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
195 words
A sensor assembly for a halogenated gas leak detector comprising a helical heater coil formed of platinum wire having a thickness in a range of 1 to 3 mils, an elongated electrode positioned within said coil substantially parallel to the longitudinal axis thereof, said electrode being formed of platinum wire having a diameter in the range of 0.5 mil to 2 mils, a coating of cured porous ceramic material deposited on the portion of said electrode disposed within the coil to stiffen and insulate the electrode, an alkali metal salt selected from the class including rubidium carbonate and sodium carbonate being disposed in the pores of said ceramic material, and a block of cured porous cement formed tightly around the coating on said central electrode and around at least the innermost 120 arcuate degrees of the surface of each turn of said coil thereby to position the electrode and coil and the respective turns of the coil in fixed relationship to one another, said coil and electrode being connectable to a source of electric energy for applying a voltage across the gap between the coil and electrode and for supplying heating current to the coil.
Claim 2
Dependent Claim
195 words
A sensor assembly for a halogenated gas leak detector comprising a helical heater coil formed of platinum wire having a thickness in a range of 1 to 3 mils, an elongated electrode positioned within said coil substantially parallel to the longitudinal axis thereof, said electrode being formed of platinum wire having a diameter in the range of 0.5 mil to 2 mils, a coating of cured porous ceramic material deposited on the portion of said electrode disposed within the coil to stiffen and insulate the electrode, an alkali metal salt selected from the class including rubidium carbonate and sodium carbonate being disposed in the pores of said ceramic material, and a block of cured porous cement formed tightly around the coating on said central electrode and around at least the innermost 120 arcuate degrees of the surface of each turn of said coil thereby to position the electrode and coil and the respective turns of the coil in fixed relationship to one another, said coil and electrode being connectable to a source of electric energy for applying a voltage across the gap between the coil and electrode and for supplying heating current to the coil.
Claim 3
Dependent Claim
20 words
An invention as defined in claim 1 wherein the outside diameter of said coil is no greater than 0.020 inches.
Claim 4
Dependent Claim
26 words
An invention as defined in claim 2 wherein said block of porous cement surrounds at least 180 arcuate degrees of the surface of each coil turn.
Claim 5
Dependent Claim
29 words
An invention as defined in claim 3 wherein said cement contains about 99 percent by weight Al 2 O 3 and not more than 1 percent SiO 2 .
Claim 6
Dependent Claim
47 words
An invention as defined in claim 2 wherein said block of porous cement is formed by applying a slurry of uncured cement to the coil and electrode in their assembled relationship then air drying the cement to cure it in position around the turns of the coil.
Claim 7
Dependent Claim
35 words
An invention as defined in claim 5 wherein said block of porous cement is further cured by applying heating current through said coil to raise its temperature to about 1300°C for at least 5 seconds.
Claim 8
Dependent Claim
25 words
An invention as defined in claim 6 wherein said coating of porous ceramic material is deposited on the central electrode by an electrostatic painting process.
Claim 9
Dependent Claim
16 words
An invention as defined in claim 7 wherein said coating is at least 0.001 inches thick.
Claim 10
Dependent Claim
30 words
An invention as defined in claim 8 wherein said coating is dipped in a solution of rubidium carbonate and fired to sinter the material in the pores of the coating.