DO

David A. Opperman

CP Colorado Voice Clinic, P.C.: 6 patents #1 of 1Top 100%
📍 Littleton, CO: #138 of 1,939 inventorsTop 8%
🗺 Colorado: #4,179 of 40,980 inventorsTop 15%
Overall (All Time): #438,549 of 4,157,543Top 15%
11
Patents All Time

Issued Patents All Time

Showing 1–11 of 11 patents

Patent #TitleCo-InventorsDate
12376939 Method of marking a specimen 2025-08-05
D990679 Tissue specimen marking clip 2023-06-27
11464599 Specimen marking mechanism Robert Witkow 2022-10-11
11432716 Retractor and tip extender therefor 2022-09-06
D955572 Retractor 2022-06-21
D905236 Retractor 2020-12-15
D866759 Retractor 2019-11-12
10349823 Retractor and tip extender therefor 2019-07-16
10238373 Retractor 2019-03-26
10111727 Surgical specimen marking mechanism Robert Witkow 2018-10-30
9750915 Nasal cannula comfort tip Robert Witkow 2017-09-05