Defensive publication
Abstract
Abstract A MOLDED ARTICLE ESPECIALLY ADAPTED FOR USE AS HIGHFRICTION ARTICLES SUCH AS BRAKE LININGS, IS PROVIDED WHEREIN THE MOLDED ARTICLE IS CHARACTERIZED BY A CO-EFFICIENT OF FRICTION OF FROM 0.4 TO 0.8 AND A WEAR CONSTANT OF AT LEAST 50, AND CONSISTS OF BETWEEN ABOUT 20% AND ABOUT 60% BY WEIGHT OF A LINEAR AROMATIC POLYIMIDE RESIN, FROM BETWEEN ABOUT 15% AND ABOUT 50% BY WEIGHT OF A FIBROUS FILLER SUCH AS ASBESTOS FIBERS, FROM BETWEEN ABOUT 5% AND ABOUT 20% OF A METAL SUCH AS COPPER IN ELONGATED FORM, FROM BETWEEN ABOUT 2% AND ABOUT 10% OF AN ABRASIVE FILLER SUCH AS ALUMINUM OXIDE IN A SILICONCONTAINING DISPERSION WHEREIN SAID ABARSIVE IS CHARACTERIZED BY A HARDNESS OF AT LEAST ABOUT 8 ON THE MOH SCALE, AND UP TO ABOUT 25% BY WEIGHT OF A SILICEOUS GLASS.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |