Koyama; Yoshio
Patent Applications and Registrations
Patent applications and USPTO patent grants for Koyama; Yoshio.The latest application filed is for "valve seat".
- Koyama; Yoshio - Tokyo JP
- Koyama; Yoshio - Gifu N/A JP
- KOYAMA; Yoshio - Chiyoda-ku Tokyo
- Koyama; Yoshio - Kani JP
- Koyama, Yoshio - Kani-shi JP
- Koyama; Yoshio - Takaishi JP
- Koyama; Yoshio - Osaka JP
- Koyama; Yoshio - Toyonaka JP
| Patent | Date |
|---|---|
| Valve seat Grant 10,036,287 - Koyama , et al. July 31, 2 | 2018-07-31 |
| Valve seat Grant 9,581,056 - Koyama , et al. February 28, 2 | 2017-02-28 |
| Valve seat Grant 9,556,761 - Koyama , et al. January 31, 2 | 2017-01-31 |
| Valve Seat App 20160333456 - KOYAMA; Yoshio ; et al. | 2016-11-17 |
| Valve Seat App 20160201527 - KOYAMA; Yoshio ; et al. | 2016-07-14 |
| Valve Seat App 20150047596 - Koyama; Yoshio ; et al. | 2015-02-19 |
| Sintered alloy for valve seats, valve seat and manufacturing method thereof Grant 6,951,579 - Koyama October 4, 2 | 2005-10-04 |
| Sintered alloy for valve seats, valve seat and manufacturing method thereof App 20030177863 - Koyama, Yoshio | 2003-09-25 |
| Method for the prevention of post oxidation of methacrolein Grant 4,968,846 - Kuragano , et al. November 6, 1 | 1990-11-06 |
| Purification process of methacrylic acid Grant 4,879,412 - Iwasaki , et al. November 7, 1 | 1989-11-07 |
| Discharge pipe and discharge apparatus using the same Grant 4,801,090 - Yoshida , et al. January 31, 1 | 1989-01-31 |
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