A proprietary item by definition is any item that is exclusively owned by a private individual or corporation under a trademark or patent that is selected for use exclusively in WSDOT Contract. 

The following are examples of proprietary item requests and approvals:

Proprietary Item Request


Proprietary Item Shell


Proprietary Item Blanket Approval 


Proprietary Item Research Work Plan

Please see the Plans Preparation Manual, M22-31, Division 7, for more information on proprietary items, justification, and approval.