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In contrast the patent application number is usually represented as a unitary number with commas between the hundreds and the thousands portion, and between the thousands and the millions portion of the number.
Beginning in 1912 utility patent numbers entered the millions.
Private PAIR lets lawyers see details of applications they've filed. Applications are confidential for 18 months after filing.
Published patent applications look similar to granted patents.
So it is not unusual for a published patent application to be mistaken for a granted patent.
You can see a full list of the patent numbers by year here.
Currently we are in the 8 million range for patent numbers.
A patent application publication generally begins with a year followed by a “/” and then a number.