Grate bar assembly for a rock crusher
Abstract
Abstract 4. A GRATE BAR ASSEMBLY FOR A ROCK CRUSHER COMPRISING: AT LEAST ONE LOWER GRATE ELEMENT HAVING BARS SPACED BY OPENINGS EXTENDING FROM THE UPPER FACE TO THE LOWER FACE THEREOF, AND AT LEAST UPPER GRATE ELEMENT HAVING BARS SPACED BY OPENINGS EXTENDING FROM THE UPPER TO THE LOWER FACE THEREOF, SAID UPPER GRATE ELEMENT BEING SUPPORTED ON SAID LOWER GRATE ELEMENT FOR READY REMOVAL AND REPLACEMENT WHEN WORN, THE OPENINGS IN SAID UPPER GRATE ELEMENT BEING OF A SIZE TO PERMIT PASSAGE THERETHROUGH OF CRUSHED MATERIAL OF A DESIRED DIAMETER, THE OPENINGS IN SAID LOWER GRATE ELEMENT BEING OF SIZE AT LEAST EQUAL TO THE SIZE OF THE OPENINGS IN SAID UPPER GRATE ELEMENT SO AS TO NOT IMPEDE PASSAGE THERETHROUGH OF SUCH MATERIAL PASSED THROUGH THE OPENINGS IN SAID UPPER GRATE ELEMENT, THE OPENINGS IN SAID UPPER AND LOWER GRATE ELEMENTS BEING IN REGISTRY, SAID UPPER GRATE ELEMENT BEING FORMED OF HIGH ABRASION RESISTANT METAL, SAID LOWER GRATE ELEMENT BEING FORMED OF METAL OF HIGH STRENGTH.
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Bibliographic Details
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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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |