Brevetti di coperchi 

Lid for cooking utensils - US 645045 A

 Lid for cooking utensils - US 1017183 A

Pot-lid - US 1145723 A

 Cover for cooking vessels - US 1193954 A

Lid for cooking utensils and retaining device therefor - US 1207699 A

 Lid-retainer - US 1207974 A

 Lid for double domestic boilers - US 1774276 A

 Lid for cooking vessels - US 1961571 A

 Cooking vessel lid - US 2220664 A

 Cover for cooking utensils - US 2636636 A

 Pot lid with magnetic quick-detachable handle - US 2731663 A

cooking pot lid - US D256085 S