US3069072A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impeller blading for centrifugal compressors
Assignee: Individual
•
Filing: 1960-06-10
•
Granted: 1962-12-18
•
Expires: 1980-06-10
Abstract
No abstract record available.
Inventors
- 👤 Birmann Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:24
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/284; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/141; F01D5/146
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US867874A
Cited
GB496820A
Cited
US2561840A
Cited
DE922394C
Cited
US2463976A
Cited
GB628052A
Cited
US2576700A
Cited
US2671604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |