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The ornamental design for an office chair, as shown and described.
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1. Office chair
| Patent | Priority | Assignee | Title |
| Patent | Priority | Assignee | Title |
| 3774960, | |||
| 4007962, | Jan 10 1975 | Fehlbaum | Chair with adjustable back |
| 4830430, | Jan 30 1987 | Equus Marketing AG | Split-back chair, particularly office chair |
| 7837265, | Mar 24 2006 | HNI TECHNOLOGIES INC | Reclining chair with enhanced adjustability |
| D391424, | Jan 03 1997 | TAYLOR CHAIR COMPANY, THE | Chair seat |
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| D558994, | Mar 24 2006 | HNI Corporation | Chair |
| D576812, | Aug 11 2006 | Vitra AG | Chair |
| D654280, | Oct 09 2008 | Okamura Corporation | Chair |
| D666841, | Apr 26 2010 | PNC BANK, NATIONAL ASSOCIATION, AS ADMINISTRATIVE AGENT | Office chair |
| D673384, | Sep 07 2011 | Jianhua, Yang | Office chair |
| D714069, | Nov 19 2013 | Mesh back task chair | |
| D724367, | Oct 31 2012 | SIDIZ, INC | Swivel chair |
| D761579, | Oct 17 2014 | ARPER S P A | Office chair |
| D768401, | Oct 17 2014 | ARPER S P A | Office chair |
| D777494, | May 22 2015 | DAVIS FURNITURE INDUSTRIES, INC | Chair frame |
| D815868, | Feb 02 2016 | OFFICE MASTER INC | Office chair |
| D845692, | Jun 13 2016 | MILLERKNOLL, INC | Chair and chair components |
| D846932, | Nov 22 2017 | OFFICE DEPOT, INC | Chair |
| D889159, | Aug 15 2018 | DONGGUAN BOYI FURNITURE CO., LTD. | Chair |
| D904057, | Feb 01 2019 | SHENZHEN YUEYANG HOME FURNITURE CO , LTD | Office chair |
| Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
| Date | Maintenance Fee Events |
| Date | Maintenance Schedule |