Average Co-Inventor Count = 1.41
ph-index = 14
The patent ph-index is calculated by counting the number of publications for which an author has been cited by other authors at least that same number of times.
Company Filing History:
1. Kabushiki Kaisha Topcon (42 from 1,033 patents)
2. Nippon Steel Corporation (7 from 3,581 patents)
3. Topcon Corporation (7 from 530 patents)
4. Mitsubishi Denki Kabushiki Kaisha (5 from 21,351 patents)
5. Nippon Steel Sumitomo Metal Corporation (1 from 1,102 patents)
67 patents:
1. D1087797 - Surveying instrument
2. D971038 - Level indicator for survey
3. D971037 - Surveying instrument
4. D935911 - Surveying instrument
5. D859185 - Surveying instrument
6. D835532 - Surveying instrument
7. D834968 - Light wave distance measuring theodolite
8. D834969 - Light wave distance measuring theodolite
9. D795720 - Surveying instrument
10. D795721 - Surveying instrument
11. D787345 - Light wave optical measuring theodolite
12. D783426 - Surveying instrument
13. D783427 - Surveying instrument
14. D781730 - Optical measuring theodolite using light wave
15. D781731 - Optical measuring theodolite using light wave