US3070149A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-low fuel burning systems in conjunction with plural fire chambers
Assignee: Individual
•
Filing: 1958-01-23
•
Granted: 1962-12-25
•
Expires: 1978-01-23
Abstract
No abstract record available.
Inventors
- 👤 William R Irwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 00:27
CPC Classifications
F; F23; F23N; F23N1/00; F23N1/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1610007A
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US1670626A
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US1637820A
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US1835611A
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US1938089A
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US2039910A
Cited
US2196377A
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US2172105A
Cited
US2286296A
Cited
US2308555A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-24 | 1966-06-25 | 1966-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-24 | 1970-06-25 | 1970-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-24 | 1974-06-25 | 1974-12-25 | $7700.00 | Window Closed / Lapsed |