US2620167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combination muffler and heat exchanger
Assignee: Individual
•
Filing: 1948-10-14
•
Granted: 1952-12-02
•
Expires: 1968-10-14
Abstract
No abstract record available.
Inventors
- 👤 Hopp William Fredrick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:31
CPC Classifications
F; F01; F01N; F01N5/00; F01N5/02; F02; F02M; F02M1/00; F01N1/00; F01N2240/00; F01N2240/02; F02M2700/00; F02M2700/43; F02M2700/4302; F02M2700/434; F02M2700/4342; F02M2700/4345; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1023323A
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US1066341A
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US1466579A
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US1468398A
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US1724559A
Cited
US1684186A
Cited
GB323196A
Cited
US1967757A
Cited
US2050281A
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US2364617A
Cited
US2362985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |