Viewing and oral communications assembly for doors

Details Viewing and oral communications assembly for doors Viewing and oral communications assembly for doors

1987-06-30

1988-08-16

Kannan, Philip C.

Movable or removable closures

Mounted for optional movements

One closure movable separately from or with other closure

350319, 350587, 350601, 350612, E06B 728

Patent

active

047634448

ABSTRACT:
A viewing and oral communications assembly for doors generally rectangular in shape, having mirror surfaces to transmit images from positions adjacent to the door through the assembly and having audio communication slots which are closed by expansion of intumescent material in the presence of heat.

REFERENCES:
patent: 141476 (1873-08-01), Voss et al.
patent: 425500 (1890-04-01), Evans
patent: 584078 (1897-06-01), Jensen
patent: 1799164 (1931-04-01), Griswold
patent: 1901303 (1933-03-01), Keil
patent: 2096740 (1937-10-01), Frankel
patent: 2624922 (1953-01-01), Ackerman
patent: 3203052 (1965-08-01), Curtis, Jr.
patent: 3973835 (1976-08-01), Miyakawa et al.
patent: 4050792 (1977-09-01), Svensson
patent: 4116529 (1978-09-01), Yamaguchi
patent: 4251127 (1981-02-01), Yamaguchi
patent: 4571901 (1986-02-01), Morris et al.
"With Safety in View", Womans Weekly, Aug. 1987.

Affiliated with

Also associated with

Rating

Viewing and oral communications assembly for doors does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Viewing and oral communications assembly for doors, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Viewing and oral communications assembly for doors will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-592880