Master cylinder
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Nov 18, 2008
Grant Date -
N/A
app pub date -
Mar 2, 2006
filing date -
Feb 26, 2001
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A master cylinder of the invention supplies a brake fluid from a large diameter pressurizing chamber 56 to a small diameter hydraulic chamber 49 by opening a reverse flow checking opening and closing portion 61 by sliding movement of a stepped piston 16 forwardly, that is, fast fill and when the hydraulic pressure of the large diameter pressurizing chamber 56 rises, a control valve 86 escapes the hydraulic pressure of the large diameter pressurizing chamber 56 to a reservoir 12 to gradually lower in accordance with rise of the hydraulic pressure of the small diameter hydraulic chamber 49, thereby capable of reducing a strange feeling in a pedal feeling caused by sudden pressure release of the large diameter pressurizing chamber 56.
First Claim
all claims..Other Claims data not available
Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
---|---|---|
KABUSHIKI KAISHA HITACHI SEISAKUSHO | 6-6 MARUNOUCHI 1-CHOME CHIYODA-KU TOKYO 100-8280 |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Ando, Hiromi | Kawasaki, JP | 43 | 259 |
# of filed Patents : 43 Total Citations : 259 | |||
Koshimizu, Naganori | Kawasaki, JP | 30 | 213 |
# of filed Patents : 30 Total Citations : 213 | |||
Ogiwara, Takato | Kawasaki, JP | 17 | 117 |
# of filed Patents : 17 Total Citations : 117 | |||
Sano, Kenji | Kawasaki, JP | 133 | 2019 |
# of filed Patents : 133 Total Citations : 2019 |
Cited Art Landscape
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Patent Citation Ranking
- 2 Citation Count
- B60T Class
- 3.97 % this patent is cited more than
- 17 Age
Forward Cite Landscape
- No Forward Cites to Display

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 |
Full Text

Legal Events
Date | Code | Event | Description |
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Aug 05, 1996 | FPAY | FEE PAYMENT | year of fee payment: 12 |
Aug 06, 1992 | FPAY | FEE PAYMENT | year of fee payment: 8 |
Oct 31, 1988 | FPAY | FEE PAYMENT | year of fee payment: 4 |
Nov 01, 1987 | FEPP | FEE PAYMENT PROCEDURE | free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: SMALL ENTITY |
Jul 02, 1985 | I | Issuance | |
May 01, 1985 | STCF | INFORMATION ON STATUS: PATENT GRANT | free format text: PATENTED CASE |
May 07, 1984 | F | Filing | |
May 07, 1984 | AS | ASSIGNMENT | free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:CAMPBELL, GAYLON S.;TANNER, BERTRAND D.;GAUTHIER, ROBERT V.;REEL/FRAME:004258/0644;SIGNING DATES FROM 19840209 TO 19840423 Owner name: CAMPBELL SCIENTIFIC, INC. |

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