What do a, b, B 1, b and so on after the U.S. patent number mean?

After the U.S. patent number, A stands for public, because the patent application is published first and then reviewed, so marking A on the text of the patent application does not mean that the patent right can finally be obtained.

B is the announcement text. After the patent application has passed the examination, the Patent Office will announce that it has obtained the patent right.

B 1 Announcement for revision refers to the situation that others put forward different opinions that it cannot be granted a patent right, and the patentee regains the patent right after revision.

There are three kinds of American patents: utility patents, plant patents and design patents. American invention patents are 20 years from the date of filing, and the maintenance fees are paid in the third and a half years, seven and a half years and eleven and a half years from the date of registration respectively. The scope of protection relates to the patent of the composition or the method of using the composition, and its validity can be extended to 5 years at the longest.

Extended data:

Materials needed to apply for a US patent:

First, the United States invention and design patent application:

1, specification, patent application part and attached drawings;

2. affidavit and power of attorney;

3. Personal declaration (the applicant is an individual, or a small enterprise with less than 500 employees, or a non-profit organization).

Second, the provisional application:

1, description, drawings and names, addresses and nationalities of all inventors;

2, small personal declaration

Third, claim priority:

If the same invention (or design) has been applied in other Paris Convention countries, and the original application date is claimed in the United States, an application shall be filed with the United States Patent Office within one year (including Taiwan Province Province) from the application date of the first foreign application (the design is half a year).

4. Novelty requirements (principle of first invention and principle of one-year preferential period)

The invention has been patented in the United States or other countries or published in publications, or has been publicly used or sold in the United States for more than one year, and the invention has lost its novelty; On the other hand, if it is less than one year, it still has the novelty of applying for a patent.

Baidu Encyclopedia-American Patent System

Baidu Encyclopedia-American Patent Law