Patent US2824558A successfully refreshed from Google Patents.
US2824558A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ear plug
Assignee: MSA Safety Inc
•
Filing: 1956-05-24
•
Granted: 1958-02-25
•
Expires: 1976-05-24
Abstract
No abstract record available.
Inventors
- 👤 Paul L Michael
- 👤 Borsh Joseph
- 👤 John P Strange
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:57
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/06; A61F11/08; A61F11/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |