Examiner Examiner Tuan Dao, Whose Telephone/Fax Numbers Are (571) 270 3387 And (571) 270 4387, Respectively. The Examiner Can Normally Be Reached On Every Monday-Thursday, And The Second Friday Of The Bi-Week From 7:30Am To 5:00Pm. If Attempts To Reach The Examiner By Telephone Are Unsuccessful, The Examiner’S Supervisor, Chat Do, Can Be Reached At (571) 272 3721. The Fax Phone Number For The Organization Where This Application Or Proceeding Is Assigned Is (571) 273 8300. Any Inquiry Of A General Nature Of Relating To The Status Of This Application Or Proceeding Should Be Directed To The Tc 2100 Group Receptionist
Grant ratio: 76.4% (74th percentile in Art Unit 2193 among examiners with at least 20 applications). Average office actions per grant: 2.01. Most common rejection type: §103.
Recently active
Last office action in data: August 2026
Examiner record
- Examiner ID
- 86736
- Primary art unit
- 2193
- Work group
- 2190
- Technology center
- 2100
- Applications
- 830
- Granted applications
- 634
- Examiner phone
- (571) 272-2100
- Supervisor
- Chat Do
- Supervisor phone
- (571) 272-3721
Save this analysis
Download this examiner report.
Log in / Sign Up to exportPeer comparisons
| Group | Examiners | Average grant ratio | Average office actions / grant |
|---|---|---|---|
| Art Unit | 36 | 55.4% | 1.85 |
| Group | 238 | 52.6% | 2.03 |
| Tech Center | 1,781 | 52.8% | 2.19 |
| USPTO | 16,475 | 52.7% | 1.98 |
Office actions per application
| Office actions | Applications | Share of applications |
|---|---|---|
| No OA observed | 1 | 0.1% |
| 1 OA | 376 | 45.3% |
| 2 OAs | 242 | 29.2% |
| 3 OAs | 101 | 12.2% |
| 4 OAs | 68 | 8.2% |
| 5+ OAs | 42 | 5.1% |
Each application is counted once. “5+” includes all higher counts.
Grant history
Recent ratios may be lower while applications remain pending.
Yearly counts
| Year | Applications | Grants | Grant rate |
|---|---|---|---|
| 2009 | 17 | 10 | 58.8% |
| 2010 | 38 | 24 | 63.2% |
| 2011 | 43 | 31 | 72.1% |
| 2012 | 46 | 38 | 82.6% |
| 2013 | 61 | 46 | 75.4% |
| 2014 | 55 | 44 | 80.0% |
| 2015 | 54 | 45 | 83.3% |
| 2016 | 52 | 43 | 82.7% |
| 2017 | 63 | 53 | 84.1% |
| 2018 | 52 | 40 | 76.9% |
| 2019 | 51 | 47 | 92.2% |
| 2020 | 41 | 39 | 95.1% |
| 2021 | 42 | 40 | 95.2% |
| 2022 | 42 | 41 | 97.6% |
| 2023 | 44 | 41 | 93.2% |
| 2024 | 40 | 32 | 80.0% |
| 2025 | 54 | 20 | 37.0% |
| 2026 | 35 | 0 | 0.0% |
Rejections by office-action stage
| Office-action stage | Actions observed | §101 | §102 | §103 | §112 |
|---|---|---|---|---|---|
| Action 1 | 829 | 5.8% | 4.6% | 86.7% | 0.2% |
| Action 2 | 453 | 4.0% | 3.5% | 90.1% | 0.4% |
| Action 3 | 211 | 2.8% | 2.8% | 90.0% | 1.4% |
| Action 4 | 110 | 4.5% | 3.6% | 88.2% | 0.9% |
| Action 5 | 42 | 4.8% | 4.8% | 85.7% | 4.8% |
| Action 6 | 17 | 0.0% | 0.0% | 94.1% | 5.9% |
| Action 7 | 9 | 0.0% | 0.0% | 88.9% | 11.1% |
| Action 8 | 3 | 0.0% | 0.0% | 100.0% | 0.0% |
Section 101 rejections
Last 3 years: 2023-08-28–2026-08-28. All years includes every dated office action in the data.
By year
3.1%
1.8%
1.6%
2.3%
0.0%
2014: Alice
0.8%
1.0%
1.8%
7.0%
9.8%
2019: PEG
1.3%
1.5%
14.8%
9.0%
6.5%
2024: AI examples
10.3%
2025: August memo
13.1%
13.6%
Each bar is the percentage of office actions with a §101 rejection.
PTAB appeals
Matched decisions: 22. Merits outcomes: 14 affirmed, 5 affirmed in part, and 3 reversed.
- Full reversal rate
- 13.6% 3/22 decisions
- Full or partial reversal rate
- 36.4% 8/22 decisions
- Median appeal duration
- 25.6 months
- New grounds of rejection
- 1
Recent decisions
| Decision | Application | Outcome | Issues |
|---|---|---|---|
| Dec. 11, 2025 | 17/701,665 | Affirmed | §103 |
| May. 14, 2021 | 14/874,101 | Affirmed | §103 |
| Mar. 21, 2017 | 13/773,337 | Affirmed in part | §103 |
| Dec. 29, 2016 | 13/221,836 | Reversed | §103 |
| Oct. 27, 2016 | 13/251,150 | Reversed | §102 · §103 |
| Oct. 26, 2016 | 12/821,784 | Affirmed | §103 |
| Jun. 20, 2016 | 13/251,152 | Affirmed in part | §103 |
| Jun. 20, 2016 | 13/251,146 | Affirmed | §103 |
| Apr. 15, 2016 | 13/251,121 | Affirmed in part | §103 |
| Mar. 8, 2016 | 13/221,837 | Affirmed | §102 · §103 · §120 |
| Mar. 1, 2016 | 13/459,637 | Affirmed | §102 · §103 |
| Feb. 24, 2016 | 11/620,727 | Affirmed | §103 |
The examiner match uses the last recorded office action before the decision. Reversal rates exclude rehearings, remands, dismissals, and other decisions that did not reach the merits. Data through Aug. 27, 2026.