US3519228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airfoil structure
Assignee: Dow Chemical Co
•
Filing: 1967-09-29
•
Granted: 1970-07-07
•
Expires: 1987-09-29
Abstract
No abstract record available.
Inventors
- 👤 Leo J Windecker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:56
CPC Classifications
B; B64; B64C; B64C3/00; B64C3/26; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24157; Y10T428/24174; Y10T428/24479; Y10T428/24488; Y10T428/24496; Y10T428/24504; Y10T428/24512; Y10T428/24521; Y10T428/24545; Y10T428/2457
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1973-07-06 | 1974-01-05 | 1974-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-06 | 1978-01-05 | 1978-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-06 | 1982-01-05 | 1982-07-07 | $7700.00 | Window Closed / Lapsed |