US2956474A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lens retainer
Assignee: MSA Safety Inc
•
Filing: 1958-07-08
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Granted: 1960-10-18
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Expires: 1978-07-08
Abstract
No abstract record available.
Inventors
- 👤 Henry A Holzwarth
- 👤 Joseph J Wetherell
- 👤 John D Wark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:25
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/08; A62B18/082; A61; A61F; A61F9/00; A61F9/02; A61F9/025; Y; Y10; Y10T; Y10T24/00; Y10T24/14; Y10T24/149
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-18 | 1964-04-18 | 1964-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-18 | 1968-04-18 | 1968-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-18 | 1972-04-18 | 1972-10-18 | $7700.00 | Window Closed / Lapsed |