Combined air filter and freshener

Details Combined air filter and freshener Combined air filter and freshener

1979-01-15

1981-03-31

Largen, James R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

D2304

Patent

active

D02587580

REFERENCES:
patent: D227669 (1973-07-01), Mann
patent: D234597 (1975-03-01), Diachuk
patent: D244856 (1977-06-01), Haufe
patent: D248869 (1978-08-01), Risher
patent: 1794447 (1931-03-01), Bothezat
patent: 2609888 (1952-09-01), Beringer
patent: 2911291 (1959-11-01), Engel
patent: 3273323 (1966-09-01), Whitfield
patent: 3299620 (1967-01-01), Hollingworth
patent: 3370403 (1968-02-01), D'Elia et al.
patent: 3465504 (1969-09-01), Oropeza et al.
patent: 3496703 (1970-02-01), MacLeod et al.
patent: 3537239 (1970-11-01), Dunmire
patent: 3668840 (1972-06-01), Pierick
patent: 3722182 (1973-03-01), Gilbertson
patent: 3747300 (1973-07-01), Knudson
patent: 3828530 (1974-08-01), Peters
patent: 3868896 (1975-03-01), Doll et al.
patent: 3928008 (1975-12-01), Petersen
patent: 4025325 (1977-05-01), Goodwin, Jr.

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