Open ducts designed for ready disassembly and re-use

Details Open ducts designed for ready disassembly and re-use Open ducts designed for ready disassembly and re-use

1976-09-23

1979-07-17

Aegerter, Richard E.

Pipes and tubular conduits

Combined

138107, 138178, 165 45, 405131, 47 142, 47 19, F16L 1112

Patent

active

041611934

ABSTRACT:
Open ducts for ground heating of hothouses consist of flattened tubes of flexible material such as plastic. The tubes are slit open lengthwise, folded back over tensioned cords and secured by fasteners so as to form the edges of the ducts, the two ends of which remain tubular and are connected to the inlet and outlet pipes of a warm-water circulation system.

REFERENCES:
patent: 355994 (1887-01-01), Horwitz
patent: 920296 (1909-05-01), Erwin et al.
patent: 952315 (1910-03-01), Erwin et al.
patent: 1119573 (1914-12-01), Byrum
patent: 1709844 (1929-04-01), Durant
patent: 1838623 (1931-12-01), Hersey et al.
patent: 2222497 (1940-11-01), Bins
patent: 3762171 (1973-10-01), Bjorheim et al.
patent: 3994366 (1976-11-01), Okuma et al.

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