Portal frame design kiln

Heating – Heating apparatus element having protective cooling structure – Door – cover – door frame or rim of cover

Reexamination Certificate

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Details

C432S192000, C432S250000, C110S331000, C110S332000

Reexamination Certificate

active

07950922

ABSTRACT:
A portico furnace includes a number of porticos (1), which are arranged parallel to one another and which define the spans of the furnace, and supports (2, 6) that are attached to the porticos (1), between which are positioned interjoists (3) that constitute the walls of the furnace. At least some of the interjoists (3) consist of a chimney block (4) with an axis that is parallel to the supports (2, 6).

REFERENCES:
patent: 2255617 (1941-09-01), Hoak
patent: 2634694 (1953-04-01), Hazen
patent: 3045616 (1962-07-01), Reich
patent: 3240173 (1966-03-01), Bunge
patent: 3589316 (1971-06-01), Longenecker
patent: 3789780 (1974-02-01), Longenecker
patent: 4413572 (1983-11-01), Musser
patent: 4474497 (1984-10-01), Sullivan
patent: 4493641 (1985-01-01), Hubbert
patent: 5062249 (1991-11-01), Smagner
patent: 5357540 (1994-10-01), Merkle et al.
patent: 6427610 (2002-08-01), Coates et al.
patent: 2834549 (2003-07-01), None

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