Apparatus for making stretched, hollow shaped strands having corrugated intermediate supports
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Jul 8, 1980
Grant Date -
N/A
app pub date -
Dec 5, 1978
filing date -
Dec 5, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
What is disclosed is a method and apparatus for forming a radially expanded and stretched tube of synthetic resin having a plurality of longitudinal-support members, corrugated in the longitudinal tube direction, joined to and extending between two opposing tube walls, by extruding the tube such that that areas of the opposing walls extending between two adjacent support members comprise alternating thick and thin wall portions in the longitudinal direction and every thin portion has a laterally-adjacent thick wall portion, whereby on subsequent stretching and expansion, the thick and thin wall portions stretch disproportionately and deform the support members attached thereto unequally to effect their corrugation in the longitudinal direction.
First Claim
Family
International Classification(s)
- [Classification Symbol]
- [Patents Count]
Cited Art Landscape
Patent Citation Ranking
Advertisement
Advertisement
Advertisement
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