Yigang Cai has filed 325 US patents, out of which 7 have been granted. Of these 325 patents, more than 49% patents are active. “Given stats based on the United States of America data”.
Do read about some of the most popular patents of Yigang Cai which have been covered by us in this article and also you can find his patents filing tend over the years, the worldwide coverage and many other stats over Yigang Cai patent portfolio.
How many patents does Yigang Cai have?
Yigang Cai has a total of 325 US patents. These patents belong to 306 unique patent families. Out of 325 patents, 160 patents are active.
How Many Patents did Yigang Cai File Every Year?
Are you wondering why there is a drop in patent filing for the last two years? It is because a patent application can take up to 18 months to get published. Certainly, it doesn’t suggest a decrease in the patent filing.
| Year of Patents Filing or Grant | Yigang Cai Applications Filed | Yigang Cai Patents Granted |
| 2021 | 6 | – |
| 2020 | 18 | – |
| 2019 | 8 | – |
| 2018 | 2 | 1 |
| 2017 | 6 | 1 |
| 2016 | 7 | – |
| 2015 | 19 | – |
| 2014 | 23 | – |
| 2013 | 21 | – |
| 2012 | 27 | – |
| 2011 | 25 | – |
How many Yigang Cai patents are Alive/Dead?
How Many Patents did Yigang Cai File in Different Countries?
Countries in which Yigang Cai Filed Patents
| Country | Patents |
| China | 166 |
| Europe | 158 |
| Japan | 116 |
| Korea (South) | 110 |
| Germany | 26 |
| Austria | 8 |
| Brazil | 7 |
| Taiwan | 6 |
| Russia | 6 |
| Spain | 5 |
| Australia | 4 |
| Israel | 4 |
| Mexico | 4 |
| Canada | 3 |
| Turkey | 1 |
10 Best Yigang Cai Patents
US20150095985A1 is the most popular patent in the Yigang Cai portfolio. It has received 75 citations so far from companies like AT&T and Qualcomm.
Below is the list of 10 most cited patents of Yigang Cai:
| Publication Number | Citation Count |
| US20150095985A1 | 75 |
| US20080183822A1 | 59 |
| US20130322344A1 | 52 |
| US20120150967A1 | 42 |
| US20080095337A1 | 37 |
| US20120215862A1 | 34 |
| US20040208165A1 | 32 |
| US20070133575A1 | 32 |
| US20090063315A1 | 32 |
| US20060281458A1 | 29 |
How many inventions of other companies were rejected due to Yigang Cai patents?
The statistics below share strategic R&D insights. It tells the companies that were trying to protect inventions similar to Yigang Cai invention. They couldn’t because Yigang Cai had protected those before them.
The top companies who faced patents application rejections citing Yigang Cai patent portfolio are Ericsson, Huawei and Verizon.
List of the key Companies who’s Patents were Rejected citing Yigang Cai –
| Company | Number of Patent Applications that faced Rejection Citing Yigang Cai Patents | Number of Rejections (102&103) |
| Ericsson | 52 | 59 |
| Huawei | 41 | 50 |
| Verizon | 34 | 37 |
| Samsung Electronics | 28 | 33 |
| Qualcomm | 21 | 21 |
| ZTE | 16 | 18 |
| Tekelec | 15 | 18 |
| IBM | 14 | 14 |
| Oracle International Corporation | 13 | 15 |
| NEC Corp | 11 | 13 |
Count of 102 and 103 Type Rejections based on Yigang Cai Patents
Top Yigang Cai Patents used in Rejecting Most Patent Applications
| Patent Number | Count of Rejected Applications |
| US20070099609A1 | 13 |
| US20110270722A1 | 13 |
| US20090264097A1 | 12 |
| US20060206504A1 | 12 |
| US20070036312A1 | 12 |
| US20070143422A1 | 11 |
| US20110039581A1 | 9 |
| US20070211872A1 | 9 |
| US20110040845A1 | 9 |
| US20080076453A1 | 9 |
| US20070280447A1 | 9 |
| US20110171958A1 | 8 |
| US20080162705A1 | 8 |
| US20070189474A1 | 7 |
| US20130074046A1 | 7 |