Gersan Establishment
25Patents
0Active
25Granted
33Portfolio score
Filing activity: Jul 16, 1990 → Apr 18, 2001
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5206699A | Sensing a narrow frequency band of radiation and gemstones | Physics | 65 | Expired |
| US5351117A | Sensing a narrow frequency band and gemstones | Physics | 35 | Expired |
| US5801819A | Distinguishing natural from synthetic diamond | Physics | 34 | Expired |
| US6187213A | Marking diamond | Physics | 22 | Expired |
| US6014208A | Examining a diamond | Physics | 20 | Expired |
| US5184732A | Shape sorting | Performing Operations; Transporting | 20 | Expired |
| US5353112A | Optical inspection method and apparatus | Physics | 19 | Expired |
| US5536943A | Method and apparatus for examining an object | Physics | 18 | Expired |
| US5835200A | Method and apparatus for examining an object | Physics | 15 | Expired |
| US5811824A | Method and an apparatus for testing whether a diamond has a layer of synthetic diamond deposited thereon | Physics | 14 | Expired |
| US5628410A | Classifying or sorting | Physics | 14 | Expired |
| US5505313A | Method and apparatus for detecting diamonds in a plurality of objects | Physics | 10 | Expired |
| US5883388A | Examining a diamond | Physics | 10 | Expired |
| US5603414A | Detecting diamonds in a rock sample | Physics | 8 | Expired |
| US6331708A | Examining a diamond | Physics | 7 | Expired |
| US5077767A | Determining the existence of misorientation in a crystal | Physics | 7 | Expired |
| US5880504A | Examining a diamond | Physics | 7 | Expired |
| US6391215B1 | Diamond marking | Performing Operations; Transporting | 5 | Expired |
| US5746645A | Working a natural or synthetic hard stone such as a gemstone | Physics | 3 | Expired |
| USD427617S | Apparatus for viewing gemstones | General | 3 | Expired |
| US6358427B1 | Marking diamond | Performing Operations; Transporting | 3 | Expired |
| US5305867A | Method and apparatus for feeding articles | Performing Operations; Transporting | 3 | Expired |
| US5413210A | Controlling a feed of objects | Electricity | 2 | Expired |
| US5177585A | P-N-P diamond transistor | Electricity | 1 | Expired |
| USD460470S1 | Viewer for gemstones | General | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.