US2861568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressurized helmet for aviators
Assignee: Individual
•
Filing: 1950-09-27
•
Granted: 1958-11-25
•
Expires: 1970-09-27
Abstract
No abstract record available.
Inventors
- 👤 Quilter John Raymond Cuthbert
- 👤 Reeves Sylvia
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:48
CPC Classifications
A; A62; A62B; A62B18/00; A62B18/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-11-24 | 1962-05-26 | 1962-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-11-24 | 1966-05-26 | 1966-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-11-24 | 1970-05-26 | 1970-11-25 | $7700.00 | Window Closed / Lapsed |