How to make sake (Japan 1992)
https://patents.google.com/patent/JP3156868B2
Production of sake (Japan 1998)
https://patents.google.com/patent/JP2000041656A
Method for improving quality of sake (Japan 1994)
https://patents.google.com/patent/JPH08251A
How to make fragrant sake (Japan 1996)
https://patents.google.com/patent/JP3565673B2
Sake mother and sake manufacturing method (Japan 1997)
https://patents.google.com/patent/JP3300814B2
Method for producing low alcohol sake (Japan 1995)
https://patents.google.com/patent/JP3014296B2
Pak for sake (Japan 1991)
https://patents.google.com/patent/JPH0597U