Method of and means for shielding the lens of a face mask
US4076373A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 10, 1976 |
| Grant date | Feb 28, 1978 |
| Priority date | — |
| Expiry date | Mar 10, 1996 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S359/90
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
Shielding of the protective lens of a face mask by forming and mounting a stack of thin sheets of transparent or translucent material on the exterior surface of the protective lens is disclosed. According to this invention, the thin sheets of the stack are removably mounted with respect to each other and with respect to the lens and each sheet is provided with an elongated flexible tab adapted to be folded over and interposed between such sheet and an adjacent sheet in the stack with the tab on only the top sheet projecting free to facilitate removal of such top sheet from the stack without unintentional removal of other sheets of the stack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.