US2419669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffuser for centrifugal compressors
Assignee: FED RESERVE BANK
•
Filing: 1942-05-08
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Granted: 1947-04-29
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Expires: 1962-05-08
Abstract
No abstract record available.
Inventors
- 👤 Birmann Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:44
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/40; F04D29/42; F04D29/44; F04D29/441; F04D29/444; F04D17/00; F04D17/08; F04D17/10; F04D17/12; F04D17/122; F05; F05D; F05D2250/00; F05D2250/70
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1321538A
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US786384A
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US840137A
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US1056689A
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US1085274A
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US1530569A
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US1590049A
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US1785460A
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US1926225A
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US2114285A
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US2216046A
Cited
US2228194A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-28 | 1950-10-28 | 1951-04-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-28 | 1954-10-28 | 1955-04-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-28 | 1958-10-28 | 1959-04-29 | $7700.00 | Window Closed / Lapsed |