Yigang Cai has filed 1160 patents, out of which 593 have been granted. Of these 1160 patents, more than 33% patents are active. Out of these 1160 patents, 340 patents filed only in the US, out of which 214 patents has been granted.
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 trend over the years, the worldwide coverage and many other stats over Yigang Cai patent portfolio.
The data of inventors’ patents made available here is solely intended for informational purposes. Although we make every effort to maintain the accuracy and comprehensiveness of the provided information, we cannot guarantee that all data is completely free of errors or entirely up-to-date. If you happen to be the Inventor and wish to contribute additional data for your respective portfolio, kindly get in touch with us.
How many patents does Yigang Cai have?
Yigang Cai has a total of 1160 patents. These patents belong to 317 unique patent families. Out of 1160 patents, 388 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 |
| 2023 | – | 10 |
| 2022 | 3 | 28 |
| 2021 | 8 | 27 |
| 2020 | 25 | 21 |
| 2019 | 29 | 29 |
| 2018 | 41 | 37 |
| 2017 | 63 | 40 |
| 2016 | 47 | 49 |
| 2015 | 57 | 52 |
| 2014 | 39 | 71 |
| 2013 | 52 | 58 |
| 2012 | 82 | 66 |
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 |
| United States Of America | 340 |
| China | 173 |
| Europe | 166 |
| Japan | 117 |
| Korea (South) | 110 |
| Germany | 27 |
| Austria | 8 |
| Brazil | 8 |
| Taiwan | 6 |
| Spain | 6 |
| Russia | 6 |
| Mexico | 4 |
| Australia | 4 |
| Canada | 3 |
| Turkey | 1 |
Where are Research Centres of Yigang Cai Patents Located?
10 Best Yigang Cai Patents
US8126123B2 is the most popular patent in the Yigang Cai portfolio. It has received 245 citations so far from companies like Headwater Partners, At&T Intellectual Property and Lifeware Labs.
Below is the list of 10 most cited patents of Yigang Cai:
| Publication Number | Citation Count |
| US8126123B2 | 245 |
| US8131266B2 | 224 |
| US8121624B2 | 222 |
| US8483135B2 | 202 |
| US20070274468A1 | 172 |
| US8347362B2 | 169 |
| CN101427244A | 166 |
| US20040088244A1 | 132 |
| US20110039581A1 | 131 |
| WO2009070179A1 | 125 |
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.
Examiners at the USPTO used 230 Yigang Cai patents in 1861 rejections (35 USC § 102 or 35 USC § 103 types).
The top companies whose faced patents application rejections citing Yigang Cai patent portfolio are Ericsson, At&T, and Huawei.
List of the Companies whose Patents were rejected citing Yigang Cai –
| Company | Number of Patent Applications that faced Rejection Citing Yigang Cai Patents | Number of Rejections (102 & 103) |
| Ericsson | 65 | 142 |
| At&T | 46 | 90 |
| Huawei | 44 | 100 |
| Alcatel-Lucent | 41 | 85 |
| Verizon | 39 | 89 |
| Samsung | 29 | 72 |
| Tekelec | 26 | 56 |
| Qualcomm | 22 | 45 |
| Zte | 16 | 38 |
| IBM | 16 | 33 |
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 |
| US8468267B2 | 27 |
| US7457609B2 | 17 |
| US8831560B2 | 16 |
| US8116728B2 | 16 |
| US8046381B2 | 16 |
| US7940904B2 | 14 |
| US9240946B2 | 12 |
| US20070143422A1 | 12 |
| US8635288B2 | 11 |
| US20080076453A1 | 10 |
| US20110039581A1 | 10 |
| US8477912B2 | 9 |
| US8139735B2 | 9 |
| US8175575B2 | 8 |
| US20070189474A1 | 8 |