US2819838A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal compressors
Assignee: Individual
•
Filing: 1952-07-23
•
Granted: 1958-01-14
•
Expires: 1972-07-23
Abstract
No abstract record available.
Inventors
- 👤 Douglas K Warner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 11:40
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/26; F04D29/28; F04D29/284; F04D21/00; F04D27/00; F04D27/02; F04D27/0207; F04D27/0215; F04D29/30; F04D29/40; F04D29/42; F04D29/44; F04D29/441; F04D29/444; F04D29/58; F04D29/582; F04D29/5846; F04D29/66; F04D29/68; F04D29/681; F05; F05D; F05D2250/00; F05D2250/50; F05D2250/52; Y; Y10; Y10S; Y10S415/00; Y10S415/914
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |