| PATENT ASSIGNEE'S COUNTRY | USA |
| UPDATE | 10.99 |
| PATENT ASSIGNEE | This data is not available for free |
| PATENT CLAIMS |
A compn suitable for mfg accoustical tiles in a water-felting process, said compn comprising - Expanded perlite - Cellulose fiber The IMPROVEMENT comprising said perlite having been treated to reduce its water retention |
| PATENT PHOTOCOPY | Available on request |
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