US3563640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for holding spectacles in a mask
Assignee: MSA Safety Inc
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Filing: 1968-08-12
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Granted: 1971-02-16
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Expires: 1988-08-12
Abstract
Abstract A FRICTION MEMBER IS SUPPORTED FOR VERTICAL ADJUSTMENT BEHIND THE WINDOW OF A MASK FACE PIECE, IN WHICH THE DEVICE CAN BE MOUNTED, AND IS PROVIDED WITH AN OPENING EXTENDING FORWARD FROM ITS REAR SIDE. A SPECTACLES FRAME BEHIND THR FRICTIN MEMBER IS PROVIDED WITH A CENTRAL SUPPORT THAT EXTENDS FORWARD INTO THE FRICTION MEMBER OPENING SO THAT THE FRAME CAN BE ADJUSTED FORWARD AND BACKWARD.
Inventors
- 👤 Layton A Wise
- 👤 Elmer E Buban
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:34
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/08; A62B18/082
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |