On August 6, 1968, Fred C. Sproul received U.S. Patent No. D211861 on a housing tract:
This was an interesting use of design patents, and may have been intended to protect parts of the Mesa Margarita neighborhood of Oceanside, California, which Sproul helped develop:
Sproul also received another design patent for a housing tract (U.S. Patent No. D220903):

and a utility patent (U.S. Patent No. 3,427,645) , which no doubt for double patenting reasons, disclaims the term beyond the expiration of his earlier ‘861 patent:

















