TXC’s tuning fork resonator, tuning fork crystal unit and tuning fork oscillator products are protected by one or more of the following United States patents or patent applications owned by Piedek Technical Laboratory and listed below. This information is provided in satisfaction of the virtual patent marking provisions pursuant to United States patent laws (35 U.S.C. §287, as amended). This list may not be exhaustive:
| 6,897,743 | 6,898,832 | 6,911,765 | 6,959,472 |
| 7,071,794 | 7,170,218 | 7,193,354 | 7,342,352 |
| 7,412,764 | 7,441,316 | 7,528,682 | 7,536,768 |
| 7,564,326 | 7,723,904 | 7,768,179 | 7,779,530 |
| 7,845,063 | 7,944,131 | 8,091,189 | 8,096,042 |
| 8,122,587 | 8,127,426 | 8,127,427 | 8,217,736 |
| 8,240,023 | 8,358,052 | 8,358,053 | 8,375,559 |
| 8,572,824 | 8,614,537 | 8,749,124 | 8,766,516 |
| 8,806,738 | 8,866,567 | 9,077,308 | 9,203,135 |
| 9,209,381 | 9,431,957 | 9,553,560 | RE44,423 |
| RE45,582 | RE45,829 |