US3452843A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary impeller and reinforcing means therefor
Assignee: Berwick Forge and Fabricating Corp
•
Filing: 1967-08-18
•
Granted: 1969-07-01
•
Expires: 1987-08-18
Abstract
No abstract record available.
Inventors
- 👤 Ray F Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:01
CPC Classifications
F; F16; F16D; F16D33/00; F16D33/18; F16D57/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T428/00; Y10T428/12; Y10T428/12486
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US587493A
Cited
US1323533A
Cited
GB217599A
Cited
US2519473A
Cited
US3016269A
Cited
US3095820A
Cited
GB905473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |