US2019928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Respirator
Assignee: MSA Safety Inc
•
Filing: 1934-12-18
•
Granted: 1935-11-05
•
Expires: 1954-12-18
Abstract
No abstract record available.
Inventors
- 👤 Charles W Punton
- 👤 Joseph B Dym
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:18
CPC Classifications
A; A62; A62B; A62B23/00; A62B23/02; Y; Y10; Y10S; Y10S55/00; Y10S55/35
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) | 1938-11-04 | 1939-05-06 | 1939-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-11-04 | 1943-05-06 | 1943-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-11-04 | 1947-05-06 | 1947-11-05 | $7700.00 | Window Closed / Lapsed |