Patent US2597764A successfully refreshed from Google Patents.
US2597764A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crash helmet
Assignee: Northrop Grumman Corp
•
Filing: 1949-08-29
•
Granted: 1952-05-20
•
Expires: 1969-08-29
Abstract
No abstract record available.
Inventors
- 👤 Tucker Charles
- 👤 Jr Lowell A Lyle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:18
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/28; A42B3/288; A42B3/10; A42B3/105; A42B3/18; A42B3/22; A42B3/24; B; B64; B64D; B64D10/00
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) | 1955-05-20 | 1955-11-19 | 1956-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-05-20 | 1959-11-19 | 1960-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-05-20 | 1963-11-19 | 1964-05-20 | $7700.00 | Window Closed / Lapsed |