Gas separation: apparatus – Solid sorbent apparatus – With indicating means
Reexamination Certificate
2005-09-08
2008-10-28
Lawrence, Frank M (Department: 1797)
Gas separation: apparatus
Solid sorbent apparatus
With indicating means
C096S416000, C055SDIG035, C128S202220
Reexamination Certificate
active
07442237
ABSTRACT:
An end-of-service-life-indicator for a multi-agent respirator filter that is safe, reliable, and easy to read and may be configured to cover a broad range of threats, including chemical warfare agents and toxic industrial chemicals, is achieved by positioning an array of chemically reactive calorimetric indicators substantially next to a sorbent bed behind a viewing window that may be integrated into the filter housing. Each colorimetric indicator in the array may be configured to produce a color change in responsive to a different target threat or threat category and may be calibrated to display easily identifiable colors, symbols or patterns to indicate an optimum time to exchange a filter.
REFERENCES:
patent: 1537519 (1925-05-01), Yablick
patent: 2249867 (1941-07-01), Snelling
patent: 3635001 (1972-01-01), Komroff et al.
patent: 3966440 (1976-06-01), Roberts
patent: 4154586 (1979-05-01), Jones et al.
patent: 4155358 (1979-05-01), McAllister et al.
patent: 4326514 (1982-04-01), Eian
patent: 4365627 (1982-12-01), Wing
patent: 4530706 (1985-07-01), Jones
patent: 4684380 (1987-08-01), Leichnitz
patent: 6497756 (2002-12-01), Curado et al.
patent: 6979361 (2005-12-01), Mihayiov et al.
patent: 2758603 (1978-07-01), None
Biffoni Ulysses John
Lawrence Frank M
The United States of America as Represented by the Secretary of
LandOfFree
Multi-agent end-of-service-life indicator for respirator... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Multi-agent end-of-service-life indicator for respirator..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Multi-agent end-of-service-life indicator for respirator... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4008319