Patent Leaderboard
USPTO Patent Rankings Data through Sept 30, 2025
JH

John Hay

NONorton: 4 patents #44 of 343Top 15%
Shrewsbury, MA: #296 of 938 inventorsTop 35%
Massachusetts: #27,608 of 88,656 inventorsTop 35%
Overall (All Time): #1,298,401 of 4,157,543Top 35%
4 Patents All Time

Issued Patents All Time

Showing 1–4 of 4 patents

Patent #TitleCo-InventorsDate
5131923 Vitrified bonded sol gel sintered aluminous abrasive bodies Carole J. Markhoff-Matheny, David Rostoker 1992-07-21
4997461 Nitrified bonded sol gel sintered aluminous abrasive bodies Carole J. Markhoff-Matheny, David Rostoker 1991-03-05
4898597 Frit bonded abrasive wheel Carole J. Markhoff-Matheny, Brian E. Swanson 1990-02-06
4634453 Ceramic bonded grinding wheel Leonard I. Smith, George E. Foster 1987-01-06