Many people in the commercial vehicle industry use a "twin" air drying arrangement.
Patent #us8118911, originally filed Nov. 10, 2006, and was granted on Feb 21, 2012, seems ridiculous to me.
For example, here is a twin dryer manufactured by the SKF corporation: H.C. Dual Turbo-2000
Would this dryer constitute prior art?
Here is claim 1 of the patent:
A device attaching a pair of desiccant cartridges such that air flows to the pair of desiccant cartridges in parallel, the device comprising:
- an inner chamber; a first fluid flow passage for communicating air to the inner chamber;
- a pair of extensions, each of the pair of extensions adapted for mounting one of the pair of desiccant cartridges;
wherein each extension is spaced at a substantially equal distance from the inner chamber; and a second and a third fluid flow passage, each fluidly connecting the inner chamber with each of the pair of threaded extensions, compressed air flowing in substantially the same direction at substantially the same time through each of the second and third fluid passages in substantially equal amounts.
More possible prior arts with an original filing date before 2006: