Some bone conduction Headphones are listed under the EUIPO (the European Union Intellectual Property Office responsible for managing the EU trade marks and the registered European Union designs.)
https://euipo.europa.eu/eSearch/#details/owners/1966162
EUIPO-patents-of-bone-conduction-Headphones
ABS Shell Sprayed Rubber Oil
ABS Shell without oil spraying
X7MAX bone conduction headphone IPX8 waterproof Bluetooth Wireless Swimming Headphone
ABS Shell without oil spraying
X27 Bone Conduction Headphone Bluetooth Wireless Running Headphone
ABS Shell without oil spraying
X9 Bone Conduction Headphone IPX8 waterproof Bluetooth Wireless Swimming Headphone
ABS Shell Sprayed Rubber Oil
Y18 Bone Conduction Headphone IPX8 waterproof Bluetooth Wireless Swimming Headphone
ABS Shell Sprayed Rubber Oil
X7PRO bone conduction headphone IPX8 waterproof Bluetooth Wireless Swimming Headphone
ABS Shell Sprayed Rubber Oil
X7S bone conduction headphone IPX8 waterproof Bluetooth Wireless Swimming Headphone
ABS Shell Sprayed Rubber Oil
G18 Bone Conduction Headphone IPX8 waterproof Bluetooth Wireless Swimming Headphone
ABS Shell Sprayed Rubber Oil
CNIPA patent products
Z12 Open Ear Clip Earbuds with 500mAh Charging Case (USB-C) Bluetooth 5.4
ABS Shell Covered Silicone
X16 Bone Conduction Headphone IPX8 Waterproof for Swimming 32G Built-in Memory
ABS Shell Sprayed Rubber Oil
X6 Bone Conduction Headphones Waterproof Wireless Bluetooth Sport open ear headphone
Some bone conduction Headphones are listed under the CNIPA (China National Intellectual Property Administration)
CNIPA-patents-of-bone-conduction-Headphones-BY Google translator
ABS Shell Sprayed Rubber Oil
ABS Shell without oil spraying
X7MAX bone conduction headphone IPX8 waterproof Bluetooth Wireless Swimming Headphone
ABS Shell without oil spraying
ABS Shell Sprayed Rubber Oil
X6R Bone Conduction Headphones Waterproof Wireless Bluetooth Sport open ear headphone
ABS Shell Sprayed Rubber Oil
X7PRO bone conduction headphone IPX8 waterproof Bluetooth Wireless Swimming Headphone
ABS Shell Sprayed Rubber Oil
G18 Bone Conduction Headphone IPX8 waterproof Bluetooth Wireless Swimming Headphone
ABS Shell Sprayed Rubber Oil
S18M Bone Conduction Headphones with extended external boom Mic
ABS Shell Sprayed Rubber Oil
CNIPA patent products
Z12 Open Ear Clip Earbuds with 500mAh Charging Case (USB-C) Bluetooth 5.4
CNIPA patent products
Z3 Open Earhook with 300mAh Charging Case (USB-C) Bluetooth 6.0
CNIPA patent products
ABS Shell Sprayed Rubber Oil
ABS Shell Sprayed Rubber Oil
ABS Shell Covered Silicone
X16 Bone Conduction Headphone IPX8 Waterproof for Swimming 32G Built-in Memory
ABS Shell Sprayed Rubber Oil
X7 bone conduction headphone IPX8 waterproof Bluetooth Wireless Swimming Headphone
ABS Shell Sprayed Rubber Oil
X18 Waterproof Bluetooth Wireless Bone Conduction Headphones
ABS Shell Sprayed Rubber Oil
X14 Bone Conduction Headphone Bluetooth Wireless Running Headphone
ABS Shell Sprayed Rubber Oil