Abstract: The subject of this patent specification is a new and extremely innovative wheelchair design, which will allow the users to easily and temporarily elevate themselves to a height greater than that of an able bodied person standing, in order to access things which are presently out of their reach, while remaining within the same size and performance constraints as most conventional manual wheelchairs. The invention accomplishes this through a new and unique elevating mechanism of the scissor type, designed to provide exceptional performance, and extreme stability especially in the fully elevated position. The invention is designed to be a general purpose, utility wheelchair, designed to assist the user with his/her day to day living and transportation. The invention also is designed to incorporate all of the features which are standard on other top of the line wheelchairs, thereby rendering it “state of the art” by today's standards, notwithstanding the new elevating feature it incorporates.

Abstract: In a catalytic method for selectively detecting carbon monoxide in the presence of hydrogen in an oxygen-containing atmosphere, such as may be used in monitoring exhaust gases from combustion processes, the catalyst is a platinum-rhodium alloy containing not less than about 10% rhodium. The catalyst is maintained at a temperature such that it will cause combustion of carbon monoxide but will not readily cause combustion of hydrogen, the thermal effect on the catalyst resulting when a test atmosphere is brought into contact with it being sensed to provide a measure of the carbon monoxide concentration in that atmosphere.