| 1988 | PIUG born; organizational meeting following IFI meeting First discussion list on Dialmail |
| 1989 | First annual one-day business meeting First newsletter |
| 1992 | First Northeast meeting |
| 1995 | Technical sessions at one-day annual meeting Thomson Derwent hosts internet discussion list |
| 1996 | CAS hosts PIUG website |
| 1998 | First multi-day annual conference focusing on technical topics PIUG Service Awards 500th subscriber to discussion list |
| 1999 | PIUG Incorporated, leading to Board of Directors |
| 2000 | First West Coast meeting Membership over 400 |
| 2001-2002 | First non-US based volunteers (Chair, Director, Webmaster) |
| 2002 | Online credit card payments accepted (through PayPal) Over 1400 discussion list subscribers First annual Brian Stockdale Memorial Award recipient |
| 2003 | Record attendance of 320 at annual conference Individual membership exceeded 600 by year end. |
| 2004 | Meeting planner hired for annual conference (2005) |
| 2005 | PIUG Trademark registered in U.S. Web pages moved to allow PIUG more flexibility (with updates/features). Improved online credit card payments (with Merchant Accounts). Online membership management (with 123Signup) |
| 2006 | Implemented new discussion list with Listbox |
| 2007 | First Boston Biotech Meeting |
| 2008 | 20th Anniversary Record attendance of 400 at annual conference. Trilateral Roundtable held at annual conference. CEPIUG and PIUG Memorandum of Understanding Signed. PIUG Wiki implemented. |
| 2009 | PIUG Wiki Discussion Forum replaced the discussion list. TEI hired as PIUG Association Manager, outcome of Executive Secretary Task Force. Proposed Bylaws Amendments approved by membership ballot voting, outcome of Membership Task Force. Three Working Groups - Certification, Training, Mentoring - formed by PIUG Education & Training Task Force (PETT). International Certification Scheme proposed by Certification Working Group. Patent Analytics Working Group established. Outreach and Collaboration with Patent Documentation Group (PDG) initiated. |
| 2010 | Bylaws Amendment to Single Membership Category took effect January 1, 2010. WIPO Workshops - Partnership with WIPO on worldwide patent information training began. PIUG Wiki registrants surpass 1330. |