Patent US1993397A successfully refreshed from Google Patents.
US1993397A
Expired / Lapsed
US
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Exhaust conduit and muffler for an automotive vehicle
Assignee: MICHIGAN STEEL TUBE PRODUCTS C
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Filing: 1930-10-10
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Granted: 1935-03-05
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Expires: 1950-10-10
Abstract
No abstract record available.
Inventors
- 👤 Richard O Berg
- 👤 Berg Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 11:28
CPC Classifications
F; F01; F01N; F01N13/00; F01N13/18; F01N1/00; F01N1/003; F01N1/08; F01N2450/00; F01N2450/22; F01N2470/00; F01N2470/02; F01N2470/04; F01N2470/06; F01N2470/24
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) | 1938-03-04 | 1938-09-03 | 1939-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-03-04 | 1942-09-03 | 1943-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-03-04 | 1946-09-03 | 1947-03-05 | $7700.00 | Window Closed / Lapsed |