Donald W. Keefer

PL Plastibec: 1 patents #7 of 15Top 50%

📍 Pasadena, MD: #4 of 13 inventorsTop 35%

🗺 Maryland: #310 of 1,619 inventorsTop 20%

Overall (1994): #141,133 of 165,921Top 90%

Patents 1994

Issued Patents 1994

Showing 1–1 of 1 patents

Patent #	Title	Co-Inventors	Date
5345628	Waterbed mattress with tethered wave motion-inhibiting inserts	—	1994-09-13