There are a lot of ways that a padlock can become a "Patented Padlock". It could be the look of the padlock which would be a design patent or it could be the way it operates which would be a utility patent. A utility patent is the stronger of the two because it can be put in or made to work in any padlock design.
from Home Improvement:Security Articles from EzineArticles.com http://EzineArticles.com/9751329
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