US2695022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Breathing apparatus oxygen augmenter
Assignee: MSA Safety Inc
•
Filing: 1952-07-05
•
Granted: 1954-11-23
•
Expires: 1972-07-05
Abstract
No abstract record available.
Inventors
- 👤 William C Hamilton
- 👤 Earl M Becker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:00
CPC Classifications
A; A62; A62B; A62B7/00; A62B7/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1005816A
Cited
US1173172A
Cited
US2403981A
Cited
US2406888A
Cited
US2492272A
Cited
US2616414A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-11-22 | 1958-05-24 | 1958-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-22 | 1962-05-24 | 1962-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-22 | 1966-05-24 | 1966-11-23 | $7700.00 | Window Closed / Lapsed |