Patent ID: 11877604
Assignee: 3M INNOVATIVE PROPERTIES COMPANY
Field: Other consumer goods (Other fields)
Classification: CPC A | IPC A

Claim 51:
52. A mask body, comprising:
at least one filtration layer; and
a perimeter that includes an upper segment that has first and second concave segments viewable in a top view plane that is projected onto a top view of the mask body when the mask body is in an open condition, wherein the first and second concave segments are located, respectively, on first and second sides of a central plane when viewing the mask body through the top view plane,
wherein the first concave segment includes a first inflection point, a second inflection point, and a third inflection point and wherein the second concave segment includes the third inflection point, a fourth inflection point, and a fifth inflection point when viewing the mask body through the top view plane,
wherein the third inflection point is located approximately on the central plane, wherein the first inflection point is located relative to the third inflection point at a distance below the third inflection point in the direction of the central plane, and wherein the fifth inflection point is located relative to the third inflection point at a distance below the third inflection point in the direction of the central plane when viewing the mask body through the top view plane.