US2497946A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Purging of hydrocarbon-containing chambers
Assignee: Dravo Corp
•
Filing: 1943-02-09
•
Granted: 1950-02-21
•
Expires: 1963-02-09
Abstract
No abstract record available.
Inventors
- 👤 Harry H Lester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:54
CPC Classifications
B; B63; B63B; B63B57/00; B63B57/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE20976E
Cited
US1735462A
Cited
US1686335A
Cited
US2023496A
Cited
US1849932A
Cited
US1843036A
Cited
US2065462A
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 |