Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 9220861 | Forehead support for facial mask | Philip Rodney Kwok, Robert Stephen Matchett | 2015-12-29 |
| 7882837 | Forehead support for facial mask | Philip Rodney Kwok, Robert Stephen Matchett | 2011-02-08 |
| 6997188 | Forehead support for facial mask | Philip Rodney Kwok, Robert Stephen Matchett | 2006-02-14 |
| 6691708 | Forehead support for facial mask | Philip Rodney Kwok, Robert Stephen Matchett | 2004-02-17 |
| 6557556 | Forehead support for facial mask | Philip Rodney Kwok, Robert Stephen Matchett | 2003-05-06 |