Apparatus and method for pre-loading mechanical constant-resistance single prop
US-10385692-B2 · Aug 20, 2019 · US
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Quan Kai patents
Quan Kai is listed as an inventor on 2 patents in our database. Major assignees and classification codes are summarized below.
| Metric | Value |
|---|---|
| Inventor | Quan Kai |
| Total patents | 2 |
| First publication | Mar 21, 2019 |
| Latest publication | Aug 20, 2019 |
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Major assignees
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| Assignee | Patents |
|---|---|
| Univ China Mining | 2 |
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