US2720356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous boundary layer control in compressors
Assignee: Individual
•
Filing: 1952-06-12
•
Granted: 1955-10-11
•
Expires: 1972-06-12
Abstract
No abstract record available.
Inventors
- 👤 John R Erwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 13:10
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/66; F04D29/68; F04D29/681; F04D29/682; F04D29/40; F04D29/52; F04D29/54; F04D29/541; F04D29/542; F04D29/545; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR963540A
Cited
DE722424C
Cited
US2344835A
Cited
GB619722A
Cited
US2618433A
Cited
US2658719A
Cited
US2675174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-10 | 1959-04-11 | 1959-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-10 | 1963-04-11 | 1963-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-10 | 1967-04-11 | 1967-10-11 | $7700.00 | Window Closed / Lapsed |