Utility patents are those for the invention of a new or improved item
99,220, including utility patents, plant patents, design patents, and reissues.
Utility, Design, and Plant.
Jewelry patents have been granted to jewelry manufacturers and artisans since 1850 for protection against copying by competitors. For precious and non precious jewelry there are design and utility patents. Design patents are used to protect the way an article looks, while a utility patent protects the way an article is used and works. Design and utility patents have separate numbering systems and utility patents far outweigh the number of design patents.
Kia Silverbrook. Silverbrook is listed as an inventor on 3123 issued US utility patents.
The USPTO granted a total of 247,727 patents from 1 January 2011 to 31 December 2011, including Reissue Patents, Plant Patents, Design Patents, and Utility Patents.
The US Patent Office issued 99,200 total patents from 1 January 1990 to 31 December 1990, including 9 reissue patents, 6 plant patents, 194 design patents, and 98,991 utility patents.
A utility patent protects the way an invention works and how it is used. In order to be considered for a Utility Patent, the invention must, at the very least, be a machine, process, manufactured item, material composition - or an improvement on any of these.
Either they have licenses for any necessary patents, their valves do not infringe any of those patents (utility or design), or the owners of those patents don't care enough to find infringers and challenge the unauthorized use.
There are two basic types of utilty patents: the non-provisional and the provisional application. Both types of patent applications are held in confidence by the USPTO, they will not show your application to anyone. Design patents are always non-provisional applications.
In the US there were 417,325 utility patents, 19,256 design patents, and 10,263 renewals between 1860 and 1890.
The most common type of patent is a utility patent, which protects a new, non-obvious, and useful process, machine, article of manufacture, or composition of matter, or an improvement to any of those. The other patents are design patents, for ornamental design of an article of manfacture, and patents on hybrid plants.
In US patent practice, the terms you're using, "full patent" and "mechanical patent," don't have any meaning. The United States Patent and Trademark Office grants three types of non-provisional patents: design patents, plant patents, and utility patents. They protect different things; one doesn't "override" the other.