Bearing arrangement with magnetic fluid defining bearing pads
Abstract
Abstract A BEARING WHEREIN A FLUID BEARING PAD IS SEALED BETWEEN TWO BEARING SURFACES, SUCH AS BETWEEN AN INNER RACE AND AN OUTER RACE. A PERMANENT MAGNET AND PERMEABLE POLE PIECES DEFINE A MAGNETIC CIRCUIT WHICH CIRCUITS PROVIDES FOR THE FLOW OF MAGNETIC FLUX ACROSS AT LEAST ONE OF THE BEARING SURFACES. A MAGNETIC GAP ON THE BEARING SURFACE THROUGH WHICH THE MAGNETIC FLUX FLOWS DEFINES A PREDETERMINED CONTINUOUS PERIPHERAL PATTERN. THE MAGNETIC FLUX IS CONCENTRATED AT THE GAP AND A MAGNETIC FLUID IS CAPTURED THEREIN. THE OTHER BEARING SURFACE ENGAGES THE MAGNETIC FLUID IN SEALING RELATIONSHIP AND THE FLUID-BEARING PAD IS SEALED BETWEEN THE BEARING SURFACES AND WITHIN THE PERIPHERY DEFINED BY THE MAGNETIC FLUID SEAL.
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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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |