Examiner Keling Zhang

Examiner Keling Zhang appears to be about average relative to their peer examiners. Their lifetime grant ratio is 45.3%, they average 1.88 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 1.88

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Examiner Details

Observed Examiner Years: 6 years (2021-2026)
Phone: (571) 272-8043
Predicted Supervisor: Ching-Yiu Fung
Supervisor Phone: (571) 270-5713
Tech Center: 1700 - Chemical and Materials Engineering
Group: 1730 - Metallurgy, Inorganic Chemistry, Catalysts, Electrophotography, Photolithography

Metrics

Applications Evaluated: 232
Granted Applications: 105
Non-Granted Applications: 127
Avg OA / Grant: 1.88
Last OA Observed: March 2026 (0 months ago)
Art Units Seen: 1732
Work Groups Seen: 1730 - Metallurgy, Inorganic Chemistry, Catalysts, Electrophotography, Photolithography

Context Comparison

Scope	Examiners	Lifetime Grant Ratio	Avg OA / Grant
This Examiner	1	45.3%	1.88
Art Unit	29	53.2%	1.92
Group	185	51.5%	1.97
Tech Center	1,713	47.3%	2.14
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	6	3	50.0%
2022	50	30	60.0%
2023	42	33	78.6%
2024	47	25	53.2%
2025	62	14	22.6%
2026	25	0	0.0%

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

Rejection Timeline

OA #	Office Actions	§ 101 Percentage	§ 102 Percentage	§ 103 Percentage	§ 112 Percentage
1	228	0.0%	6.6%	82.5%	9.6%
2	117	0.0%	4.3%	90.6%	3.4%
3	57	0.0%	8.8%	82.5%	5.3%
4	27	0.0%	0.0%	88.9%	7.4%
5	13	0.0%	0.0%	92.3%	7.7%
6	2	0.0%	0.0%	100.0%	0.0%