Building block
Latest SHANGHAI PUTAO TECHNOLOGY CO., LTD. Patents:
Description
Claims
The ornamental design for a building block, as shown and described.
Referenced Cited
U.S. Patent Documents
D284393 | June 24, 1986 | Kassai |
D285583 | September 9, 1986 | Kassai |
D290721 | July 7, 1987 | Ryaa |
D344302 | February 15, 1994 | Plagborg |
D359999 | July 4, 1995 | Schmidt |
D365857 | January 2, 1996 | Lyman |
D370035 | May 21, 1996 | Olsen |
D374257 | October 1, 1996 | Schmidt |
D389408 | January 20, 1998 | Rask |
D426588 | June 13, 2000 | Glickman |
D564044 | March 11, 2008 | Rolf |
D706363 | June 3, 2014 | Norman |
D786364 | May 9, 2017 | Richards |
D833540 | November 13, 2018 | Zhang |
D852284 | June 25, 2019 | Zhang |
20040154256 | August 12, 2004 | Kim |
Patent History
Patent number: D891531
Type: Grant
Filed: Dec 15, 2018
Date of Patent: Jul 28, 2020
Assignee: SHANGHAI PUTAO TECHNOLOGY CO., LTD. (Shanghai)
Inventors: Xiang Zhang (Shanghai), Lei Xie (Shanghai)
Primary Examiner: Cynthia M. Chin
Application Number: 29/673,567
Type: Grant
Filed: Dec 15, 2018
Date of Patent: Jul 28, 2020
Assignee: SHANGHAI PUTAO TECHNOLOGY CO., LTD. (Shanghai)
Inventors: Xiang Zhang (Shanghai), Lei Xie (Shanghai)
Primary Examiner: Cynthia M. Chin
Application Number: 29/673,567
Classifications
Current U.S. Class:
Circular (D21/488)