US2994187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating dual fuel engines
Assignee: Nordberg Manufacturing Co
•
Filing: 1958-03-03
•
Granted: 1961-08-01
•
Expires: 1978-03-03
Abstract
No abstract record available.
Inventors
- 👤 Kelgard Erik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:56
CPC Classifications
F; F02; F02B; F02B7/00; F02B7/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2731792A
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US1371444A
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US1705876A
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US1792028A
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US2198516A
Cited
US2559623A
Cited
US2400247A
Cited
US2509960A
Cited
US2748562A
Cited
US2703561A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |