The first patent relates to 6,253,312, or "method and apparatus for double operand load". This is a way for loading single-precision operands into registers in a microprocessor floating point register, including translation logic, data logic and write back logic. It's very techy stuff that goes right down to the chip.
Secondly, VIA claims Apple has infringed on 6,253,311, or an "instruction set for bi-directional conversion and transfer of integer and floating point data." It's a method for format conversion and the transfer of data between the integer and floating point register.
According to the patent description, data is moved in and out of the floating point register as integer data, and is converted into floating point format as needed. Again it runs on the processor. Patent 6,754,810 also relates to bi-directional conversion.
Via CEO Wenchi Chen said in a statement that the company is "determined to protect our interests and the interests of our stockholders when our patents are infringed upon."
The complaint has been filed for the US International Trade Commission to look at, as well as filing a case in the US District Court of Delaware.