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For the Inventor, By the Inventor

Kristiansand, Norway

Maritime Hydraulics as

Calculating rank
USPTO Granted Patents = 13

% Expired Patents = 7.7


Forward Citations = 354

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7 inventors (with patents filed for the assignee):

goldMedal Per A Vatne (6 out of 18 patents)

silverMedal Per Slettedal (2 out of 4 patents)

bronzeMedal Bjarne E Skeie (2 out of 2 patents)

4.  Terje Egeland (1 out of 1 patent)

5.  Erik Zachariassen (1 out of 1 patent)

6.  Marek Sokalski (1 out of 1 patent)

7.  Erling Tambs (1 out of 1 patent)


13 patents:

1. 6860694 - Horizontal pipe handling device (2005-03-01),
2. 6589343 - Device for application of dope on male threads (2003-07-08),
3. 6202274 - Arrangement for fastening a piston-cylinder arrangement and method for replacing sealings therein (2001-03-20),
4. 6148922 - Slip joint (2000-11-21),
5. 6095501 - Stretch compensation in a hoisting system for a derrick (2000-08-01),
6. 6094910 - Apparatus and method for raising and lowering a piston in a piston (2000-08-01),
7. 6032929 - Arrangement in connection with a yoke in a hoisting system for a derrick (2000-03-07),
8. 5709285 - Brake for a hoisting apparatus (1998-01-20),
9. 4979356 - Torque wrench (1990-12-25),
10. 4822230 - Pipe handling apparatus (1989-04-18),
11. 4791999 - Well drilling apparatus (1988-12-20),
12. 4593773 - Well drilling assembly (1986-06-10),
13. 4582133 - Pipe handling assembly (1986-04-15),
Company Overview
Maritime Hydraulics AS, based in Kristiansand, Norway, specializes in the development and manufacturing of hydraulic systems and solutions tailored for the maritime and offshore industries. The company focuses on delivering innovative hydraulic technologies that enhance operational efficiency and safety in challenging marine environments. With a commitment to quality and sustainability, Maritime Hydraulics plays a crucial role in advancing hydraulic applications that support the evolving needs of the maritime sector.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

13 Patents

#4 in Kristiansand

#128 in Norway

#45,104 in the World

Kristiansand, NO
Kristiansand, Norway

Maritime Hydraulics as

Forward Citations = 354

7 inventors:

goldMedal Per A Vatne (6 out of 18 patents)

silverMedal Per Slettedal (2 out of 4 patents)

bronzeMedal Bjarne E Skeie (2 out of 2 patents)

4.  Terje Egeland (1 out of 1 patent)

5.  Erik Zachariassen (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Maritime Hydraulics as. Retrieved from https://idiyas.com/company/maritime-hydraulics-as

Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile

Data Sources: USPTO Patent Grant XML, Patent Center, EPO & CIPO • Normalized by IDiyas Innovation Graph. Methodology & provenance architecturePlease report any incorrect information to [email protected]
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