Patent US2843341A successfully refreshed from Google Patents.
US2843341A
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US
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Airfoils, variable permeability material and method of fabrication thereof
Assignee: Individual
•
Filing: 1956-01-18
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Granted: 1958-07-15
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Expires: 1976-01-18
Abstract
No abstract record available.
Inventors
- 👤 Robert E Dannenberg
- 👤 James A Weiberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:22
CPC Classifications
B; B64; B64C; B64C21/00; B64C21/02; B64C21/06; B64C2230/00; B64C2230/06; B64C2230/22; Y; Y02; Y02T; Y02T50/00; Y02T50/10; Y10; Y10S; Y10S62/00; Y10S62/05; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249961
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |