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For the Inventor, By the Inventor

Tokyo, Japan

Masao Ohyama

This inventor holds 14 USPTO granted patents, primarily in Magnetic Tape Technology. Top assignee: Sony Corporation. Active years: 1987-1999.

IDiyas Innovation Intelligence. (2026). Inventor Profile: Masao Ohyama. Retrieved from https://idiyas.com/inventor/masao-ohyama

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

Calculating rank
USPTO Granted Patents = 14

% Patents Active = 100.0

Average Co-Inventor Count = 1.9

ph-index = 7

Forward Citations = 107(Granted Patents)


Location History:

  • Tokyo,, JP (1992)
  • Tokyo, JP (1987 - 1999)

Company Filing History:

goldMedal14 out of 58,150 
 
Sony Corporation
 patents

Years Active: 1987-1999

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Areas of Expertise:
Magnetic Tape
Recording Apparatus
Reproducing Apparatus
Cassette Holder
Optical Mechanism
Cleaning Device
Lock Mechanism
Loading System
Braking Mechanism
Engagement Portion
Protective Closure
Tape Player
14 patents (USPTO):Explore Patents
1. 5995467 - Disc recording and/or reproducing apparatus with a liftable optical (1999-11-30),
2. 5835317 - Cleaning device for magnetic tape recording and/or reproducing apparatus (1998-11-10),
3. 5162956 - Cassette holder assembly having multiple projections differentiated in (1992-11-10),
4. 5126909 - Slider lock braking mechanism for setting modes in tape player (1992-06-30),
5. 4935895 - Magnetic tape cassette loading system in recording and/or reproducing (1990-06-19),
6. 4908723 - Compact recording and/or reproducing apparatus with oblique rotary head (1990-03-13),
7. 4881137 - Magnetic tape cassette with tape protective closure and lock mechanism (1989-11-14),
8. 4843510 - Magnetic tape cassette with tape protective closure and lock mechanism (1989-06-27),
9. 4816953 - Tape cassette with groove engageable with loading hook (1989-03-28),
10. 4799117 - Magnetic tape cassette loading system in recording and/or reproducing (1989-01-17),
11. 4777546 - Cassette-type magnetic tape recording and/or reproducing apparatus with (1988-10-11),
12. 4694360 - Tape cassette with concave engagement portion and player with hook (1987-09-15),
13. 4685008 - Magnetic recording and/or reproducing apparatus with tape loading and (1987-08-04),
14. 4641210 - Magnetic recording and reproducing apparatus (1987-02-03),

Title: Masao Ohyama: Innovator in Optical Disc Technology

Introduction

Masao Ohyama is a prominent inventor based in Tokyo, Japan. He has made significant contributions to the field of optical disc technology, holding a total of 14 patents. His work has been instrumental in advancing the capabilities of disc recording and reproducing apparatuses.

Latest Patents

One of Ohyama's latest patents is for a disc recording and/or reproducing apparatus with a liftable optical mechanism. This innovative apparatus includes a carrier mechanism that transports a disc both inside and outside the device. The optical pickup apparatus is designed to radiate beams onto the disc, utilizing an objective lens for precision. Additionally, the apparatus features a shutter that can either expose or close the upper surface of the objective lens, allowing for efficient recording and reproducing operations. Another notable patent is for a cleaning device specifically designed for magnetic tape recording and reproducing apparatuses.

Career Highlights

Masao Ohyama is currently employed at Sony Corporation, where he continues to develop cutting-edge technologies in the field of optical media. His expertise and innovative spirit have positioned him as a key player in the industry.

Collaborations

Ohyama has collaborated with notable colleagues such as Yoshinori Yamamoto and Kenji Kawakami. Their combined efforts have led to advancements in optical disc technology and have contributed to the success of their projects.

Conclusion

Masao Ohyama's contributions to optical disc technology through his numerous patents highlight his role as a leading inventor in the field. His work continues to influence the industry and pave the way for future innovations.

Profile summary based on public USPTO records.
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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