- Filing date: 2021-04-22
- Request for accelerated examination: 2021-07-28
- Notice of preliminary rejection: 2021-08-09
- Amendment and written argument filed: 2021-09-10
- Decision to grant: 2021-11-23
- Registration: 2021-11-24
- Title of invention: Freeze protection device and method for hot-air heaters
[Note] Accelerated examination was obtained by commissioning a prior art search from a designated search agency, and the application was registered in about 7 months.
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