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In 1608, Dutch eyeglass maker Hans Lipperhey filed the first patent for a working telescope. The patent was denied.
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| Number | Title | Issue Date |
| 6325060 | Stack-equipped far infrared space heater A stack-equipped far infrared space heater capable of permitting a space of a relatively large volume through which hot air for fan forced space heating fails to carry well to be satisfactorily heated by far infrared rays. The space heater includes a comb... | 12/04/2001 |
| 6295937 | Intake/exhaust type combustion equipment An intake/exhaust type combustion equipment capable of permitting oxygen in a proper amount required for stable combustion to be constantly fed to the combustion equipment, irrespective of outdoor air conditions. An intake air temperature detection sensor... | 10/02/2001 |
| 5584685 | Discharge-type ignition device for oil burner A discharge-type capable of accomplishing ignition of a wick at a position convenient or suitable for the ignition. Spark discharge for ignition of a wick is started in the course of raising of the wick. Thus, any possible variation in height of the wick ... | 12/17/1996 |
| 5524605 | Cooking burner A non-open fire type cooking burner capable of exhibiting endurance, workability and safety. Heat combustion or exhaust gas produced by combustion in a burner body are guided to a heat exchanger made of metal and discharged through an exhaust pipe to an e... | 06/11/1996 |
| 5203687 | Control system for burner A control system for a burner is disclosed which detects oxygen concentration in a room using an oxygen sensor, to thereby supply an abnormality detecting signal to at least one of an alarm and a combustion reducing device to actuate it when oxygen concen... | 04/20/1993 |
| 5169306 | Multi-cylinder combustion structure for oil burner A multi-cylinder combustion structure for an oil burner capable of permitting a red-heated section of a double combustion cylinder to be uniformly red-heated while ensuring complete combustion irrespective of the amount of combustion, to thereby exhibit s... | 12/08/1992 |
