Also known as IPC classification table. The landlord can Baidu Encyclopedia.
B4 1J 2/435 refers to:
B stands for Operation and Transportation Department.
4 1 stands for printing department.
J stands for typewriter; Selective printing mechanism, that is, printing mechanism that does not print; Correction of typesetting errors
2/ stands for typewriter or selective printing mechanism designed for printing or marking process.
435 is characterize in that radiation is selectively provided to prin materials or transfer materials.
B4 1J 3/4 13 means:
B4 1J 3/ stands for typewriter or selective printing mechanism with use characteristics.
4 13 stands for metal.
The following is a copy of the encyclopedia.
The international patent classification table is compiled according to the Strasbourg Agreement on International Patent Classification signed in 197 1, and it is the only international patent document classification and retrieval tool at present.
IPC is divided into five levels: part, class, subclass, main group, group,
For example, the IPC of the patent "Automatic Manual Mosaic" (ZL94230987. 1) is A4 1G I/00, and the IPC of the patent "Double-row Telephone Keyboard" (ZL0 1257 183.0) is H04m/Kloc-0.
Among them, the middle part is the highest classification layer in the classification table, and it is divided into eight parts according to different fields, marked with one-digit English letters, that is, A.H. There are several categories under each department, which are composed of two digits, and there are different categories under each department, such as A0 1, agriculture; Forestry; Animal husbandry; Hunting; Trap; Fishing; Subclasses consist of a capital letter, such as A0 1B, agricultural or forestry land preparation; Parts, components or accessories of general agricultural machinery or tools; Each subclass is subdivided into many groups, including main group and grouping. The main group consists of advanced category number plus one to three digits and "/oo", for example: A0 18i/00, hand tools; Grouping consists of labels with subcategory number or above and subcategory number plus one to three digits, plus two to four digits except "oo".