Static structures (e.g. – buildings) – Stepped; e.g. – stair – Tread unit on horizontal tread member connected to riser
Reexamination Certificate
2004-12-28
2010-12-14
Safavi, Michael (Department: 3637)
Static structures (e.g., buildings)
Stepped; e.g., stair
Tread unit on horizontal tread member connected to riser
Reexamination Certificate
active
07849643
ABSTRACT:
A riser is formed by a structural sandwich plate member in the run or tread portion but a simple steel plate in the rise portion. This riser is cheaper and simpler to manufacture than risers in which both the run and tread are formed by structural sandwich plate members.
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patent: 4899504 (1990-02-01), Hirschhorn
patent: 5014475 (1991-05-01), Anderson, Jr. et al.
patent: 5778813 (1998-07-01), Kennedy
patent: 6050208 (2000-04-01), Kennedy
patent: 6895717 (2005-05-01), Grinstead
patent: 2003/0207116 (2003-11-01), Franken et al.
patent: WO-01/32414 (2001-05-01), None
patent: WO-02/33200 (2002-04-01), None
Intelligent Engineering (Bahamas) Limited
Nixon & Vanderhye P.C.
Safavi Michael
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