The most common type of patent is Utility Patent. Inventions that produce a utilitarian result by functioning in a distinctive way are covered under this patent. Any new, useful and unique, improvement on any existing machine, process, manufacture etc. is considered suitable to file for a Utility Patent.
Velcro fasteners, new drugs, electronic circuits, software, semiconductor manufacturing processes are Utility Patents. Even new bacteria, new animals, plants, automatic transmissions, and virtually all possible things that can be produced by a human are examples of Utility inventions.
A Utility Patent has a term period of 20 years. Once the patent is issued, one can get the rights to a term of 20 years from the date of filing the first application for the Invention.
Design Patents: Any unique, ornamental, or visible shape or design of a useful object comes under design patents. Any thing which has a unique appearance can be patented. It can be a building, a computer case, computer screen icons, or a desk with exceptional shape.
It can also be the stylish look of a pen holder, but the way the pens are kept in the holder is functional and a design patent cannot protect the feature of function.
It is necessary that the uniqueness of design must be visual and ornamental. When the the shape is functional and aesthetic, A utility patent is only absolute and proper to be filed for the invention.
There is a constructive way to differentiate between utility invention and a design. It is to ask, ” Whether the function of the device will be materially affected, if the novel features are removed?”
If the answer is yes then, a Utility Patent is applicable for the invention. As an example, a a couch has a nice design, that is made to make it look better, but has no practical use in the invention, then a design patent would be appropriate.
For example, a bed has a particular design that makes it pleasing for the eye and helps the function of the bed so much that, it will not be possible to separate the design and the function of the bed, then a Utility application is applicable.
Like wise, a baseball bat and a fishing rod may have a stylish design, but if it proves useful in the purpose it serves to catch fish or hit a home run respectively, then a Utility application is suitable.
Thus if the Design, is first and foremost functional, then it cannot be patented as a “Design Patent”, but can be protected by a Utility Patent.
The term of a Design Patent is 14 years from the time it is granted.
Plant Patents: Patents are issued for new and unique varieties of Plants. A Patent is granted to Plants that can reproduce asexually. By the means of the techniques of grafting and cutting, one can reproduce the plant asexually.
Those plants that reproduce by pollination are called sexually reproducible plants and can be granted a patent under the Plant Variety Protection Act.
Under special circumstances a Utility Patent can also be issued to a sexually or asexually reproducing Plant.