Patent US2498044A successfully refreshed from Google Patents.
US2498044A
Expired / Lapsed
US
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Assignee: Keppel LeTourneau USA Inc
•
Filing: 1946-04-13
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Granted: 1950-02-21
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Expires: 1966-04-13
Abstract
No abstract record available.
Inventors
- 👤 Tourneau Robert G Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:02
CPC Classifications
E; E02; E02F; E02F3/00; E02F3/04; E02F3/76; E02F3/7663; E02F3/7668; E02F3/7677
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US404774A
Cited
US1714152A
Cited
USRE19987E
Cited
US1814635A
Cited
US1841403A
Cited
US2281224A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-02-20 | 1953-08-22 | 1954-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-20 | 1957-08-22 | 1958-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-20 | 1961-08-22 | 1962-02-21 | $7700.00 | Window Closed / Lapsed |