US3390545A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boundary layer control on interstage guide vanes of a multistage centrifugal compressor in a refrigeration system
Assignee: Trane US Inc
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Filing: 1967-06-28
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Granted: 1968-07-02
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Expires: 1987-06-28
Abstract
No abstract record available.
Inventors
- 👤 David C Hoffman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:08
CPC Classifications
F; F25; F25B; F25B1/00; F25B1/04; F25B1/053; F04; F04D; F04D17/00; F04D17/08; F04D17/10; F04D17/12; F04D17/122; F04D29/00; F04D29/66; F04D29/68; F04D29/681; F04D29/684; F25B2400/00; F25B2400/13; F25B2400/23; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2277647A
Cited
US3011322A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-07-02 | 1972-01-01 | 1972-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-02 | 1976-01-01 | 1976-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-02 | 1980-01-01 | 1980-07-02 | $7700.00 | Window Closed / Lapsed |