A 12" lens that covers 11x14 has to cover a 73 degree angle. That is very wide for a process lens. And there's no guarantee that the lens can be put in shutter.
If you don't mind a slightly narrow field of view, some 19" process lenses should cover at infinity. Best to avoid models with long, narrow barrels as these would probably vignette in the corners. If you can find a Wollensak Apochromatic Raptar in that focal length, it should work well. Most process lens users control exposure with either the lenscap or a Packard shutter or mount the lens in front of a large leaf shutter using a custom adapter.
If you don't mind a slightly narrow field of view, some 19" process lenses should cover at infinity. Best to avoid models with long, narrow barrels as these would probably vignette in the corners. If you can find a Wollensak Apochromatic Raptar in that focal length, it should work well. Most process lens users control exposure with either the lenscap or a Packard shutter or mount the lens in front of a large leaf shutter using a custom adapter.
I use with 12"/24"/28"Turner Reich Triple Convertible on my 11x14 view camera. The 12" combination will cover 11x14. I suspect that the lens would cover 11x14.