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For the Inventor, By the Inventor

Osaka, Japan

Kassai Kabushikikaisha

Calculating rank
USPTO Granted Patents = 58

% Expired Patents = 1.7

Forward Citations = 1,187

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3 inventors (with patents filed for the assignee):

goldMedal Kenzou Kassai (55 out of 194 patents)

silverMedal Kenzo Kassai (2 out of 2 patents)

bronzeMedal Masayuki Otsuki (1 out of 1 patent)


Core Competencies:
Baby Carriage
Infant Walking Trainer
Collapsible Chair
Toy Vehicle
Tricycle
Emergency Locking Device
Hammock
Construction Toy
Pushcart Handle
Caster
Frame Structure
Vehicle for Children

58 patents:

1. 6638434 - Method for automatically controlling the level of dissolved oxygen in water based on a pressure tank system equipped with sterilizer (2003-10-28),
2. D286416 - Toy construction piece (1986-10-28),
3. D285584 - Construction toy (1986-09-09),
4. D285583 - Construction toy (1986-09-09),
5. D285226 - Construction toy (1986-08-19),
6. 4597116 - Bed for baby carriages (1986-07-01),
7. D284393 - Construction toy (1986-06-24),
8. D284207 - Construction toy (1986-06-10),
9. 4577877 - Pushcart handle height adjusting mechanism (1986-03-25),
10. 4577355 - Frame structure for baby carriage bed (1986-03-25),
11. 4571760 - Carry-cot (1986-02-25),
12. 4570288 - Spring supported caster having a disengageable swivel lock (1986-02-18),
13. 4567964 - Wheel stopping device (1986-02-04),
14. D282384 - Riding toy (1986-01-28),
15. 4565388 - Structure for connecting a handle to the push rods of a baby carriage (1986-01-21),
Company Overview
Kassai Kabushikikaisha, based in Osaka, Japan, specializes in the development and manufacturing of innovative child safety products. The company focuses on creating a range of items designed to enhance the safety and comfort of infants and young children, including baby carriages, infant walking trainers, and collapsible chairs. Their product line also features toy vehicles, tricycles, emergency locking devices, hammocks, and construction toys, reflecting a commitment to quality and safety in child-related products.
Profile summary synthesized from public USPTO records and patent filings.

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USPTO Data Jan 1 1976 - Oct 27 2026

58 Patents

#171 in Osaka

#1,574 in Japan

#12,415 in the World

Osaka, JP
Osaka, Japan

Kassai Kabushikikaisha

Forward Citations = 1,187

3 inventors:

goldMedal Kenzou Kassai (55 out of 194 patents)

silverMedal Kenzo Kassai (2 out of 2 patents)

bronzeMedal Masayuki Otsuki (1 out of 1 patent)

IDiyas Innovation Intelligence. (2026). Company Patent Portfolio: Kassai Kabushikikaisha. Retrieved from https://idiyas.com/company/kassai-kabushikikaisha

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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