Examiner Xiaoyan Zou

Appears inactive Last observed office action: February 2023 (37 months ago).

Examiner Xiaoyan Zou appears to be about average relative to their peer examiners. Their lifetime grant ratio is 63.0%, they average 2.66 office actions per granted patent, and their rejection profile is dominated by §103.

Difficulty vs AU About Average

Difficulty vs Group About Average

Difficulty vs TC About Average

Difficulty vs USPTO About Average

Average OA / Grant 2.66

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Examiner Details

Observed Examiner Years: 3 years (2021-2023)
Tech Center: 1600 - Biotechnology and Organic
Group: 1640 - Immunology

Metrics

Applications Evaluated: 46
Granted Applications: 29
Non-Granted Applications: 17
Avg OA / Grant: 2.66
Last OA Observed: February 2023 (37 months ago)
Art Units Seen: 1641 , 1677
Work Groups Seen: 1640 - Immunology

1670 - Virology and Related Immunology

Context Comparison

Scope	Examiners	Lifetime Grant Ratio	Avg OA / Grant
This Examiner	1	63.0%	2.66
Art Unit	28	44.8%	2.26
Group	223	44.8%	1.94
Tech Center	1,349	39.5%	2.02
USPTO	16,116	54.8%	1.98

Grant Timeline

Shaded region marks the last two observed years, where grant outcomes may lag due to recency.

Year	Applications	Granted	Grant Rate
No observed data before 2021; examiner may not yet have been active in the available dataset.
2021	10	9	90.0%
2022	27	15	55.6%
2023	9	5	55.6%
No observed data after 2023; examiner may have gone inactive or moved out of examining work.

29 family-cache-validated grants; 0 OA-only grant signals.

Rejection Timeline

OA #	Office Actions	§ 101 Percentage	§ 102 Percentage	§ 103 Percentage	§ 112 Percentage
1	64	0.0%	1.6%	70.3%	3.1%
2	43	0.0%	9.3%	72.1%	2.3%
3	17	0.0%	5.9%	64.7%	5.9%
4	11	0.0%	0.0%	63.6%	9.1%
5	6	0.0%	0.0%	83.3%	0.0%
6	5	0.0%	0.0%	80.0%	0.0%
7	3	0.0%	0.0%	66.7%	0.0%
8	4	0.0%	0.0%	100.0%	0.0%
9	3	0.0%	0.0%	100.0%	0.0%
10	2	0.0%	0.0%	100.0%	0.0%