| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United States | 13 | |
| #2 | Canada | 3 |
| # | Industry | |
|---|---|---|
| #1 | Mechanical elements | |
| #2 | Machines |
| # | Technology | |
|---|---|---|
| #1 | Unspecified technologies | |
| #2 | Venting or aerating devices | |
| #3 | Servomotors | |
| #4 | Unspecified technologies |
| # | Name | Total Patents |
|---|---|---|
| #1 | Beckett Donald E | 13 |
| #2 | Beckett William N | 11 |
| #3 | Moffat Allen J | 3 |
| #4 | Beckett Robin K | 3 |
| #5 | Crannell Wayne T | 2 |
| Publication | Filing date | Title |
|---|---|---|
| US3565115A | Spool valve | |
| US3507189A | Air-over-liquid hydraulic system | |
| US3504704A | Valve and control assembly | |
| US3511470A | Needle valve | |
| US3180236A | Fluid motor construction | |
| US3203439A | Spool valve with magnetic hold | |
| US3253617A | Spool valve construction | |
| US3111139A | Stack type valves | |
| US2985191A | Ball valve | |
| US2908292A | Valve spool | |
| US2869583A | Spool valve | |
| US2879788A | Manifold mounted valve | |
| US2773508A | Oscillator valve | |
| CA578787A | Oscillator valve | |
| CA575895A | Spool valve | |
| CA606826A | Valve spool |