Drumhead material and method
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Apr 2, 2002
Grant Date -
N/A
app pub date -
Jan 20, 2000
filing date -
Jan 20, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A drum head material is prepared by assembling a multi-layer laminate comprising upper and lower sheets of resilient, polymeric film and at least two oriented fiber layers positioned between said sheets. Each of the oriented fiber layers comprises parallel resilient fibers having high modulus of elasticity and a defined direction of orientation. The layers are positioned such that the directions of orientation of the two layers intersect. The layers are pressed to adhere them and form a drumhead membrane. In the preferred form, the films are of polyethylene terephthalate and the fibers are of polyaramid. If two fiber layers are employed, the fibers in the layers preferably intersect at right angles. If three layers of fibers are employed, the fibers preferably intersect at an angle of 60 degrees.
First Claim
Family
International Classification(s)
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