Filter having a change indicator

Details Filter having a change indicator Filter having a change indicator

1998-07-14

2000-08-29

Smith, Duane S.

Gas separation: apparatus

Electric field separation apparatus

With indicating, signal, or alarm means

96414, 96421, B01D 4644

Patent

active

061102601

ABSTRACT:
Disclosed is a change indicator for a filter for use in a gaseous circulation system, such as a forced air heating and cooling system. The change indicator includes an air impervious patch that is secured to the filter. The portion of the filter media adjacent to the change indicator changes appearance in response to the accumulation of contaminants at a much slower rate than the remainder of the air filter. The accumulation of contaminants progresses inwardly from the region adjacent the periphery of the change indicator towards the region adjacent to the center. Once the appearance of the filter media beneath the change indicator fully changes from periphery to the center, that is an indication that the air filter is in need of cleaning or replacement.

REFERENCES:
patent: Re30782 (1981-10-01), van Turnhout et al.
patent: Re31285 (1983-06-01), van Turnhout et al.
patent: 2721533 (1955-10-01), Alderfer
patent: 2753831 (1956-07-01), Davies
patent: 2782747 (1957-02-01), Alderfer
patent: 2804839 (1957-09-01), Hallinan
patent: 2849005 (1958-08-01), Tucker et al.
patent: 3027865 (1962-04-01), Kautz et al.
patent: 3254784 (1966-06-01), Lancesseur
patent: 3635001 (1972-01-01), Komroff et al.
patent: 3916817 (1975-11-01), Kemp
patent: 4103058 (1978-07-01), Humlicek
patent: 4130487 (1978-12-01), Hunter et al.
patent: 4215682 (1980-08-01), Kubik et al.
patent: 4321070 (1982-03-01), Bede
patent: 4336038 (1982-06-01), Schultheiss et al.
patent: 4363682 (1982-12-01), Thiebault
patent: 4547420 (1985-10-01), Krueger et al.
patent: 4588537 (1986-05-01), Klaase et al.
patent: 4592815 (1986-06-01), Nakao
patent: 4795668 (1989-01-01), Krueger et al.
patent: 4798850 (1989-01-01), Brown
patent: 4880448 (1989-11-01), Scherrer
patent: 4904174 (1990-02-01), Moosmayer et al.
patent: 4955995 (1990-09-01), Pontius
patent: 4988560 (1991-01-01), Meyer et al.
patent: 5009308 (1991-04-01), Cullen et al.
patent: 5122048 (1992-06-01), Deeds
patent: 5230800 (1993-07-01), Nelson
patent: 5325707 (1994-07-01), Slater
patent: 5350620 (1994-09-01), Sundet et al.
patent: 5401446 (1995-03-01), Tsai et al.
patent: 5496507 (1996-03-01), Angadjivand et al.
patent: 5505753 (1996-04-01), Heysek
Van Turnhout et al., Electret Filters for High-Effeciency and High-Flow Air Cleaning, IEEE Transactions on Industry Applications, vol. IA-17, No. 2, pp. 240-248 (Mar./Apr. 1981).

Affiliated with

Also associated with

Rating

Filter having a change indicator does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Filter having a change indicator, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Filter having a change indicator will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1245204