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US1835883A
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Assignee: MSA Safety Inc
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Filing: 1930-03-20
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Granted: 1931-12-08
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Expires: 1950-03-20
Abstract
No abstract record available.
Inventors
- 👤 John M Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:51
CPC Classifications
A; A42; A42B; A42B3/00; A42B3/04; A42B3/06
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) | 1934-12-07 | 1935-06-08 | 1935-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1938-12-07 | 1939-06-08 | 1939-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1942-12-07 | 1943-06-08 | 1943-12-08 | $7700.00 | Window Closed / Lapsed |