US2421643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety helmet
Assignee: Individual
•
Filing: 1944-07-08
•
Granted: 1947-06-03
•
Expires: 1964-07-08
Abstract
No abstract record available.
Inventors
- 👤 Arnold J Ostli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:32
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/0406; A42B3/0433; A42B3/044
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1318850A
Cited
US731908A
Cited
US1444249A
Cited
US1540372A
Cited
US1513237A
Cited
US1749998A
Cited
US1772439A
Cited
US1901180A
Cited
US2254966A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-06-02 | 1950-12-02 | 1951-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-06-02 | 1954-12-02 | 1955-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-06-02 | 1958-12-02 | 1959-06-03 | $7700.00 | Window Closed / Lapsed |