US2848155A
Expired / Lapsed
US
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Boundary layer control apparatus for compressors
Assignee: RTX Corp
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Filing: 1955-08-24
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Granted: 1958-08-19
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Expires: 1975-08-24
Abstract
No abstract record available.
Inventors
- 👤 George F Hausmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:04
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/66; F04D29/68; F04D29/681; F04D29/682; F04D29/26; F04D29/32; F04D29/321; F04D29/40; F04D29/52; F04D29/54; F04D29/541; F04D29/542; F04D27/00; F04D27/02; F04D27/0207; F04D27/0215; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 0
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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) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |