Tent – canopy – umbrella – or cane – Umbrella – Self-opening and closing
Patent
1985-09-19
1987-11-17
Joyce, Harold
Tent, canopy, umbrella, or cane
Umbrella
Self-opening and closing
98 331, 981153, 135 93, 135105, 135106, F24F 7007
Patent
active
047065516
ABSTRACT:
A controlled access enclosure comprises an external frame (1) within which is suspended a cover (15). Access is gained to and from the unit by means of a zipped opening (20) in one part of the enclosure and a flap door arrangement in another part of the enclosure, the flap door being surrounded by a flange (21) which may be sealed to a hazardous working area to prevent contamination escaping from the working area into the surrounding clean environment.
REFERENCES:
patent: 1315497 (1919-09-01), Higdon et al.
patent: 1884449 (1932-10-01), Wickstrum
patent: 2010472 (1935-08-01), Angel
patent: 2612900 (1952-10-01), Treppa
patent: 2943634 (1960-07-01), Morgan
patent: 3051163 (1962-08-01), Trexler
patent: 3055379 (1962-09-01), Fink
patent: 3119358 (1964-01-01), Colson et al.
patent: 3766844 (1973-10-01), Donnelly et al.
patent: 3925828 (1975-12-01), Kim
patent: 4581986 (1986-04-01), Conklin et al.
J. C. Penney Advertisement, The Washington Post Newspaper, Nov. 2, 1977.
Joyce Harold
Lewen Bert J.
Sternberg Henry
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