Jack L Young

US Patent:

41645383, Aug 14, 1979

Filed:

Nov 11, 1977

Appl. No.:

5/850845

Inventors:

Jack H. Young - Cambridge Springs PA
Frank E. Halleck - Erie PA

Assignee:

American Sterilizer Company - Erie PA

International Classification:

A61L 500
A61L 100
A61L 300

US Classification:

422 26

Abstract:

Methods and apparatus for steam sterilization in which goods are conditioned by removing air and heating to a desired temperature in a sealable chamber. Pressure change in the chamber is monitored and employed to control conditioning. The goods are subjected to a plurality of controlled cyclic pressure pulses below a predetermined supra-atmospheric pressure level by alternate evacuation and vapor pressurization of the chamber. The cyclic pressure pulsing is made responsive to load characteristics which are determined by monitoring pressure change in the chamber. In a specific embodiment, air is flushed from the chamber initially by the injection of steam simultaneously with evacuation; the evacuation phase of each pulse continues until both a predetermined time has lapsed and a predetermined vacuum level has been attained; and, the steam pressurization phase of each pulse is continued until a fixed pressure related to sterilization temperature is reached.

US Patent:

44578920, Jul 3, 1984

Filed:

Feb 6, 1979

Appl. No.:

6/009817

Inventors:

Jack H. Young - Cambridge Springs PA

Assignee:

American Sterilizer Company - Erie PA

International Classification:

A61L 220

US Classification:

422 2

Abstract:

Methods and apparatus for the timely determination of potentially harmful biocidal gas leakage from a pressurized chamber during sterilizing operations are disclosed. Biocidal gas make-up values are monitored during the sterilizing phase to provide prompt warning of biocidal gas leakage. In one embodiment, the timing of preselected pressure increment gas make-up charges are measured and compared to minimum acceptable gas make-up charge times. In addition, absorption of biocidal gas by the load can be compensated for in sterilizing operations where load absorption is a significant factor. Also, provision is made for predicting gas absorption by the load from steam absorption data obtained during pressure-controlled conditioning cycles.

US Patent:

42039479, May 20, 1980

Filed:

Feb 2, 1979

Appl. No.:

6/008925

Inventors:

Jack H. Young - Cambridge Springs PA
Frank E. Halleck - Erie PA

Assignee:

American Sterilizer Company - Erie PA

International Classification:

A61L 500
A61L 100
A61L 300

US Classification:

422114

Abstract:

Methods and apparatus for steam sterilization in which goods are conditioned by removing air and heating to a desired temperature in sealable chamber. Pressure change in the chamber is monitored and employed to control conditioning. The goods are subjected to a plurality of controlled cyclic pressure pulses below a predetermined supra-atmospheric pressure level by alternate evacuation and vapor pressurization of the chamber. The cyclic pressure pulsing is made responsive to load characteristics which are determined by monitoring pressure change rate in the chamber. In a specific embodiment, air is flushed from the chamber initially by the injection of steam simultaneously with evacuation; the evacuation phase of each pulse continues until both a predetermined time has lapsed and a predetermined vacuum level has been attained; and, the steam pressurization phase of each pulse is continued until a fixed pressure related to sterilization temperature is reached.