| # | Country | Total Patents | |
|---|---|---|---|
| #1 | United Kingdom | 4 | |
| #2 | EPO (European Patent Office) | 3 | |
| #3 | Australia | 2 | |
| #4 | South Africa | 2 | |
| #5 | Canada | 1 | |
| #6 | New Zealand | 1 | |
| #7 | United States | 1 |
| # | Industry | |
|---|---|---|
| #1 | Engines, pumps and turbines | |
| #2 | Mechanical elements |
| # | Technology | |
|---|---|---|
| #1 | Pumps | |
| #2 | Cyclically operating valves | |
| #3 | Pistons and sealings |
| # | Name | Total Patents |
|---|---|---|
| #1 | Marchant Derek Noel | 3 |
| #2 | Melville John Gregory Emm | 2 |
| #3 | Marchant Derek N | 2 |
| #4 | Marchant D N | 1 |
| Publication | Filing date | Title |
|---|---|---|
| GB8713668D0 | Double-diaphragm pumps | |
| GB8428013D0 | Double-diaphragm pumps | |
| GB8322844D0 | Shaft sealing arrangements | |
| GB8309426D0 | Pumps |