To know how long patent is going to last we have to know two things: what kind of patent you have and its earliest filing date. By understanding a few simple rules and the different kinds of patent applications, you, too, can reliably calculate patent expiration dates.
To answer it, we must
understand the different kinds of patents and some important dates in the
patent process.
Step one: types of patent
United States law provides for different kinds of patents. Each kind has a different duration. A design patent, for example, is valid for 14 or 15 years from the date the design patent is granted, depending on when it was filed.
When most people talk about patents, they
are talking about utility patents. A utility patent protects processes,
machines, or compositions. They are the most common kind of patent and are
valid for 20 years from your earliest filing date. Determining the term of a
patent gets complicated, however, if we have more than one filing date.
Step
two: filing date
To answer: how long is a patent good for, you need to know the date you filed the patent. Filing dates are recorded by the patent office and are part of the patent record on public databases. Every patent has a filing date.
Knowing our filing date is the first step to
answering the question, How long is a patent valid? However, you can have more
than one filing date.
The provisional
patent application
For example, if you file a provisional patent application before your utility patent application, you have two filing dates. A provisional patent application is an inexpensive way for an inventor to get an informal application on file. The term of a provisional patent application is one year. The provisional patent application is a mechanism that gives inventors an extra year to run experiments, find investors, or build a prototype. That extra year, however, comes at a cost.
If you are going to claim the benefit of
your provisional patent application, the term of your patent starts on your
earliest filing date: the provisional filing date. A utility application that
claims the benefit to a provisional patent application will expire up to a year
earlier. In return for having that extra year to work on your patent, you lose
a year of patent life. So, how long does a patent last? Be sure you are
calculating the term from the right date.
The effect
of having a patent pending
Limited patent life is the cost of patent-pending status. Your first filing date drops anchor and your patent protection will only go for 20 years from that earliest filing date. That is why your first filing date is called your priority date.
There are other ways in which patent
applications can claim priority to part or all of an earlier application, but
all of them come at a cost of a shorter patent term. Keep in mind that you will
not have enforceable rights for the full duration of your patent term. You
cannot enforce a patent until the patent office allows claims and issues a
patent for your invention.
If due to the fault of the patent office,
there is a substantial delay in getting your patent claims, then you can have
the time of the delay added on to the length of your patent. This process is
called patent term extension and it occurs due to a delay in a response from
the examiner or from the application's sitting in line for a long time before
prosecution.
It also
matters when you filed
When you file your patent application also influences how long your patent lasts. For utility patent applications filed on or before June 8, 1995, you calculate the patent term differently. The patent expires 17 years from the date that claims issue. On June 8, 1995, laws went into effect that changed the term to bring United States patent law in line with the rest of the world.
A similar change for design patents occurred
more recently. For design patent applications filed on or after May 13, 2015,
the term is 15 years from the date that claims are granted to the inventor.
Before that date, the term was 14 years from the date that claims were granted.
Knowing how long your patent lasts depends
on what kind of patent you have and when you filed it. The rules can be complex,
but the underlying law is straightforward. As long as you know when the laws
changed, just remember that the earlier you get your invention on file, the
sooner your patent will expire.
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