Servoless motor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 28, 2023
Grant Date -
N/A
app pub date -
Jul 31, 2018
filing date -
Jul 31, 2018
priority date (Note) -
In Force
status (Latency Note)
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Importance

US Family Size
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Non-US Coverage
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Abstract
A hydraulic piston unit including a rotational group for driving or being driven by a driving shaft, and having a tiltable displacement element for adjusting the displacement volume of the rotational group between a minimum or a maximum displacement, wherein, on t valve segment between a kidney-shaped inlet port and a kidney-shaped outlet port at respective dead end positions of reciprocally moveable working pistons first and second control ports are located in fluid connection with cylinder bores in the cylinder block, for controlling the position of the displacement element. The hydraulic piston unit further includes a control valve with a shiftable control valve spool fluidly connected via a high pressure port to a high pressure side of the hydraulic piston unit. The control valve spool is configured to conduct hydraulic fluid from the high pressure side to one of the first or the second control port.
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 | |
---|---|---|
DANFOSS POWER SOLUTIONS INC | 2800 EAST 13TH STREET AMES IA 50010 |
International Classification(s)

- 2018 Application Filing Year
- F04B Class
- 1144 Applications Filed
- 841 Patents Issued To-Date
- 73.52 % Issued To-Date
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Frantz, Stephen | Ames, US | 4 | 2 |
# of filed Patents : 4 Total Citations : 2 | |||
Hansell, Jeffrey C | Boone, US | 20 | 77 |
# of filed Patents : 20 Total Citations : 77 | |||
Leege, Steven | Ames, US | 2 | 1 |
# of filed Patents : 2 Total Citations : 1 |
Cited Art Landscape
- No Cited Art to Display

Patent Citation Ranking
- 0 Citation Count
- F04B Class
- 0 % this patent is cited more than
- 2 Age
Forward Cite Landscape
- No Forward Cites to Display

Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
---|---|---|---|---|
3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Aug 28, 2026 |
7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Aug 28, 2030 |
11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Aug 28, 2034 |
Fee | Large entity fee | small entity fee | micro entity fee |
---|---|---|---|
Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
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

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