Dynamic magnetic information storage or retrieval – Record transport with head stationary during transducing – Disk record
Reexamination Certificate
2005-02-01
2005-02-01
Tupper, Robert S. (Department: 2652)
Dynamic magnetic information storage or retrieval
Record transport with head stationary during transducing
Disk record
Reexamination Certificate
active
06850388
ABSTRACT:
Embodiments of the invention generally provide an apparatus and method for, sealing an outer surface of a shaft to an inner surface of a hub. In one embodiment, the invention provides a magnetic fluid seal held in a gap defined by a top member and a bottom member. In one aspect, the distance from the rotational axis of the shaft to the outer periphery of the lower member is less than the distance between the rotational axis of the shaft and the outer periphery of the upper member. In another aspect, the lower member has a member that slopes between a first radial distance to a second radial distance, relative the rotational axis of the shaft. In another aspect, the member has a stepped region including a first and second region where the first stepped region corresponds to a first radial distance, and the second stepped region corresponds to a second radial distance, relative the rotational axis of the shaft.
REFERENCES:
patent: 4890850 (1990-01-01), Raj et al.
patent: 5011165 (1991-04-01), Cap
patent: 5617272 (1997-04-01), MacLeod et al.
patent: 6558042 (2003-05-01), Tompkins
Castillo Jesus Del
Minisandram Raghunath S.
Seagate Technology LLC
Tupper Robert S.
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