Issued Patents All Time
Showing 1–23 of 23 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE47347 | Self-cleaning litter box | Philip Y. H. Cheung | 2019-04-16 |
| 6950607 | Multi-fragrance scent dispenser | Po Chun Yip, Robert Fellows | 2005-09-27 |
| 6859615 | Multi-fragrance scent dispenser | Po Chun Yip, Robert Fellows | 2005-02-22 |
| 6378461 | Self-cleaning litter box | Philip Y. H. Cheung | 2002-04-30 |
| 6082302 | Self-cleaning litter box | Philip Y. H. Cheung | 2000-07-04 |
| 5727331 | Dual switch electric hair dryer | Tung-hoi Ng | 1998-03-17 |
| D343447 | Bidet | Elizabeth E. Avian | 1994-01-18 |
| 5160831 | Multi-mode control circuit and indicator arrangement for an electrical appliance | Ivan Saud, P. C. Yip | 1992-11-03 |
| 4791272 | PTC hair roller | P. C. Yip | 1988-12-13 |
| D298361 | Electric lint remover for cutting fabric pills | — | 1988-11-01 |
| 4711988 | Electric hair dryer with multi-mode switch for air temperature and flowrate control | P. C. Yip | 1987-12-08 |
| 4700729 | Lens cleaning device | — | 1987-10-20 |
| 4699159 | Flocked hair curling roller | — | 1987-10-13 |
| 4604514 | Electric curling iron with selectively lockable rotatable handles | Lai Kin | 1986-08-05 |
| 4581519 | Flocked curling iron | David Friedson, Lai Kin | 1986-04-08 |
| 4579132 | Flocked hair curling roller | — | 1986-04-01 |
| 4542284 | Electrical appliance with delayed warning alarm | Lai Kin | 1985-09-17 |
| 4513735 | Apparatus for treating the feet | Belvin F. Friedson, Ivan Saud | 1985-04-30 |
| 4492241 | Retractable curling brush | David Friedson, Lai Kin | 1985-01-08 |
| 4477716 | Flocked curling iron | David Friedson, Lai Kin | 1984-10-16 |
| 4473086 | Hair curling device having retractable teeth and locking means therefor | David Friedson, Lai Kin | 1984-09-25 |
| 4429687 | Apparatus for treating the feet | Belvin F. Friedson, Ivan Saud | 1984-02-07 |
| D270713 | Digital clock | — | 1983-09-27 |