Convert Jpg images into patterns (.pat)

Use edit Define pattern on the image to define a Photoshop pattern. Then use the preset manager to save the pattern as a *.pat file.....

To batch this you may need to use a Photoshop Script to name the patterns a action define pattern step would have a hard code pattern name. Changing that step to a script could retrieve the document name and set the pattern name the same as the jpeg name.  You could define many patterns that way then use the preset manager select all the defined patterns and save a single *.pat file with that set of patterns.