Patent US2428737A successfully refreshed from Google Patents.
US2428737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boundary layer remover for airplanes
Assignee: Individual
•
Filing: 1942-08-28
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Granted: 1947-10-07
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Expires: 1962-08-28
Abstract
No abstract record available.
Inventors
- 👤 Louis H Crook
- 👤 Willard R Custer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:57
CPC Classifications
B; B64; B64C; B64C23/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1943774A
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US1913809A
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US1980139A
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US1986064A
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US2041792A
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US2041793A
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US2071221A
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GB518663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-10-06 | 1951-04-07 | 1951-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-10-06 | 1955-04-07 | 1955-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-10-06 | 1959-04-07 | 1959-10-07 | $7700.00 | Window Closed / Lapsed |