Patent US2427664A successfully refreshed from Google Patents.
US2427664A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hearing guard and ear protector
Assignee: Individual
•
Filing: 1945-09-17
•
Granted: 1947-09-23
•
Expires: 1965-09-17
Abstract
No abstract record available.
Inventors
- 👤 James Y Dunbar
- 👤 John S Knight
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:32
CPC Classifications
A; A61; A61F; A61F11/00; A61F11/06; A61F11/08; A61F11/085; Y; Y10; Y10S; Y10S220/00; Y10S220/19
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) | 1950-09-22 | 1951-03-24 | 1951-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-09-22 | 1955-03-24 | 1955-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-09-22 | 1959-03-24 | 1959-09-23 | $7700.00 | Window Closed / Lapsed |