Base plate for suspension assembly in a hard disk drive with a hardened flange and soft hub
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 10, 1998
Grant Date -
N/A
app pub date -
Sep 16, 1997
filing date -
Sep 16, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A base plate for a suspension assembly in a hard disk drive wherein the base plate has a hardened flange and soft hub. The base plate is stamped in a progressive die in a sequence of forging and coining operations. The base plate is subsequently fully annealed to allow the material to yield at a low stress level so that the hub will create a press fit against the inner wall of an actuator arm boss hole. The base plate is passed through a secondary coining operation following the annealing step to work-harden the flange portion only. The result is a base plate with a flange portion that is hardened and a hub portion that is softer than the flange portion. The advantage is that the hardened flange is more resistant to deformation of a load beam welded thereto and the hub is more disposed to plastically deform and harden during swaging which is desirable for maintaining a press fit.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
BANKBOSTON N A AS AGENT (F/K/A/ THE FIRST NATIONAL BANK OF BOSTON AS AGENT) | 100 FEDERAL STREET BOSTON MA 02110 |
International Classification(s)

- 1997 Application Filing Year
- C21D Class
- 127 Applications Filed
- 83 Patents Issued To-Date
- 65.36 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Hanrahan, Kevin | Santa Barbara, CA | 74 | 4631 |
# of filed Patents : 74 Total Citations : 4631 | |||
Schmidt, Ryan | Santa Barbara, CA | 70 | 1858 |
# of filed Patents : 70 Total Citations : 1858 |
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Patent Citation Ranking
- 3 Citation Count
- C21D Class
- 9.30 % this patent is cited more than
- 27 Age
Forward Cite Landscape
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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