Patent US1893372A successfully refreshed from Google Patents.
US1893372A
Expired / Lapsed
US
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Apparatus for treating exhaust gases of internal combustion engines
Assignee: MSA Safety Inc
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Filing: 1929-01-11
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Granted: 1933-01-03
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Expires: 1949-01-11
Abstract
No abstract record available.
Inventors
- 👤 Constant J Kryzanowsky
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:54
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/02; F01N3/0205; F01N3/08; F01N3/10; F01N3/18; F01N3/20; F01N3/24; F01N3/30; F01N3/34; F01N2450/00; F01N2470/00; F01N2470/30; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
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) | 1936-01-03 | 1936-07-04 | 1937-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-01-03 | 1940-07-04 | 1941-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-01-03 | 1944-07-04 | 1945-01-03 | $7700.00 | Window Closed / Lapsed |