Die system for making manhole frame for spherical tanks
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 4, 1989
Grant Date -
N/A
app pub date -
Mar 24, 1987
filing date -
Mar 24, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A three piece die is provided for making an access-hole frame and includes a bottom die piece and two top pieces that are bolted together to form an integral top die piece that fits over the bottom die piece. The access-hole frame is formed using the three-piece die by placing the three-piece die in stages upon rotatable table and spraying the nonmetal moldable material onto the rotating bottom and top die pieces. The access-hole frame so produced may be used for the construction of a spherical tank made of nonmetal moldable material.
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