Examiner Andrew W Cheung

Appears inactive Last observed office action: May 2023 (36 months ago).

Examiner Andrew W Cheung appears to be about average relative to their peer examiners. Their lifetime grant ratio is 74.5%, they average 2.34 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 2.34

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Examiner Details

Observed Examiner Years: 3 years (2021-2023)
Tech Center: 3700 - Mechanical Engineering, Manufacturing and Products
Group: 3760 - Refrigeration, Vaporization, Ventilation, and Combustion

Metrics

Applications Evaluated: 55
Granted Applications: 41
Non-Granted Applications: 14
Avg OA / Grant: 2.34
Last OA Observed: May 2023 (36 months ago)
Art Units Seen: 3762
Work Groups Seen: 3760 - Refrigeration, Vaporization, Ventilation, and Combustion

Context Comparison

Scope	Examiners	Lifetime Grant Ratio	Avg OA / Grant
This Examiner	1	74.5%	2.34
Art Unit	59	59.3%	1.97
Group	377	50.6%	2.11
Tech Center	2,632	49.9%	2.01
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	22	17	77.3%
2022	22	15	68.2%
2023	11	9	81.8%
No observed data after 2023; examiner may have gone inactive or moved out of examining work.

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

Rejection Timeline

OA #	Office Actions	§ 101 Percentage	§ 102 Percentage	§ 103 Percentage	§ 112 Percentage
1	69	0.0%	1.4%	94.2%	2.9%
2	51	0.0%	3.9%	94.1%	2.0%
3	22	0.0%	0.0%	86.4%	13.6%
4	11	0.0%	9.1%	72.7%	18.2%
5	3	0.0%	0.0%	66.7%	33.3%
6	3	0.0%	0.0%	100.0%	0.0%