Self-closing exhaust fan cover

Details Self-closing exhaust fan cover Self-closing exhaust fan cover

1978-04-14

1980-08-12

Largen, James R.

Environmental heating and cooling; fluid handling and sanitary e

Heating or cooling

Element or attachment, not elsewhere specified

D2304

Patent

active

D02563894

REFERENCES:
patent: D214501 (1969-06-01), Eklund
patent: D225010 (1972-10-01), Steiner
patent: D225011 (1972-10-01), Steiner
patent: 2812703 (1957-11-01), Tobey
patent: 3012495 (1961-12-01), Miller
patent: 3202083 (1965-08-01), Eichhorn
patent: 3302551 (1967-02-01), Van Belle et al.
patent: 3472150 (1969-10-01), Strawsine
patent: 4036120 (1977-07-01), Burtershaw
patent: 4131060 (1978-12-01), Caine

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