| # | Country | Total Patents | |
|---|---|---|---|
| #1 | China | 5 | |
| #2 | Argentina | 2 | |
| #3 | Australia | 2 | |
| #4 | Brazil | 2 | |
| #5 | Israel | 2 | |
| #6 | Turkey | 2 | |
| #7 | United States | 2 | |
| #8 | Belgium | 1 | |
| #9 | Denmark | 1 | |
| #10 | Spain | 1 | |
| #11 | Mexico | 1 | |
| #12 | Netherlands | 1 | |
| #13 | New Zealand | 1 | |
| #14 | African Intellectual Property Organization | 1 | |
| #15 | Singapore | 1 |
| # | Industry | |
|---|---|---|
| #1 | Thermal processes | |
| #2 | Civil engineering |
| # | Technology | |
|---|---|---|
| #1 | Fluid heaters | |
| #2 | Heat-exchanger without contact | |
| #3 | General building constructions | |
| #4 | Air-conditioning |
| # | Name | Total Patents |
|---|---|---|
| #1 | Maruyama Noboru | 12 |
| #2 | Noboru Maruyama | 3 |
| #3 | Maruyama Nororu | 1 |
| Publication | Filing date | Title |
|---|---|---|
| CN1114735A | Hot water supplying apparatus | |
| US3575143A | Boiler and an ordinary type hot water device | |
| US3358651A | Boiler and an ordinary type hot water device in accordance with a combustion method utilizing cooling combustion method of combustion gas in addition to uniform heat distribution method |