Portable conditioned air breathing pipe
Patent 4036224 Issued on July 19, 1977. Estimated Expiration Date: 
July 19, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
July 19, 1994. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 801555 1262846 2030075 2104266 2450610 InventorsApplicationNo. 05/621372 filed on 10/10/1975US Classes:128/202.21, Smoking device simulator128/204.17, Means for heating respiratory gas or respiration device128/205.29Particulate filteringExaminersPrimary: Michell, Robert W.Assistant: Recla, Henry J. Attorney, Agent or FirmAbstractA portable conditioned air breathing pipe is provided in which a heat conductive tube having a burner or other suitable heating means therein is mounted in the pipe bowl in sealed relationship with a surrounding chamber which is connected through a tubular casing to a mouthpiece and fresh air is introduced into the surrounding chamber and heated so that heated air can be withdrawn through the mouthpiece to the mouth of the user. According to preferred embodiments, the outer surface of the heat conductive tube is provided with heat exchange fins, the interior of the heat exchange tube is provided with a heat economizer, the tubular casing is provided with a damper to admit cooler air and a filter is provided in the tubular casing between the heating chamber and the mouthpiece. | |
