B42D 15/004

Questionnaires, statistics

Official title: {Questionnaires, statistics (for manually- or mechanically-operated teaching appliances G09B3/00)}

B42D15/004 (Questionnaires, statistics) appears on 26 US grants and 18 published applications in this corpus.

Search patents in B42D
Granted patents
26
Published applications
18
Assignees
14
Inventors
36
Latest grant
12 Oct 2021

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B42D 15/004: granted patents and published applications per publication year
YearGranted patentsPublished applications
198920
199000
199100
199210
199340
199410
199520
199600
199700
199850
199940
200000
200120
200210
200300
200400
200515
200600
200700
200803
200901
201001
201102
201210
201300
201400
201500
201601
201700
201803
201901
202011
202110

By publication year. Applications have been published since 2001.

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Granted patents