Inventor
Shinichi Nagahashi
Inventor
Tokyo, JP
Overview
Patents· 4 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C21Dprimary
C21DModifying the physical structure of ferrous metals50%
C22CAlloys25%
E01BPermanent way13%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests13%
PatentTitleYear
6,361,625'High-strength, damage-resistant rail having hardness distribution of excellent damage-resistance at its head top portion'20024,933,024'Method for manufacturing a high strength rail with good toughness'19904,886,558'Method for heat-treating steel rail head'19894,767,475'Wear resistant rails having capability of preventing propagation of unstable rupture'1988Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1988–2002Patents assigned to NIPPON KOKAN KK (4)· patent assignee history
1988–2002Based in Tokyo, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| NIPPON KOKAN KK | 4 | 1988–2002 |
Locations
| Location | Patents | Span |
|---|---|---|
| Tokyo, JP | 4 | 1988–2002 |