Boxcar door having balsa core sandwich construction
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 21, 1991
Grant Date -
N/A
app pub date -
Apr 21, 1989
filing date -
Apr 21, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A door for railroad boxcars has a balsa core sandwich construction in which a balsa core is sandwiched between thin fiberglass skins and reinforced at the perimeter by steel tubes to provide an economical and lightweight door that exhibits the requisite structural strength. The door has a concavo-convex configuration that prevents thermally induced warpage from deforming the door in a manner to cause significant interference in its opening and closing movement.
First Claim
Family
International Classification(s)
Cited Art Landscape
Patent Citation Ranking
Recipient Email Address
Recipient Email Address
Comment
Recipient Email Address
Add to Portfolio(s)
To add this patent to one, or more, of your portfolios, simply click the add button.
This Patent is in these Portfolios:
Add to additional portfolios:
Last Refreshed On:
Changes done successfully