US2461931A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multistage compressor
Assignee: Metropolitan Vickers Electrical Co Ltd
•
Filing: 1944-04-06
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Granted: 1949-02-15
•
Expires: 1964-04-06
Abstract
No abstract record available.
Inventors
- 👤 Smith David Macleish
- 👤 Lloyd Charles Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:17
CPC Classifications
F; F04; F04D; F04D25/00; F04D25/02; F04D17/00; F04D17/08; F04D17/10; F04D17/12; F04D17/127; F04D19/00; F04D19/02; F04D19/024
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) | 1952-02-15 | 1952-08-16 | 1953-02-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-15 | 1956-08-16 | 1957-02-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-15 | 1960-08-16 | 1961-02-15 | $7700.00 | Window Closed / Lapsed |