US2697402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impeller construction for rotary pressure pumps
Assignee: Individual
•
Filing: 1950-09-15
•
Granted: 1954-12-21
•
Expires: 1970-09-15
Abstract
No abstract record available.
Inventors
- 👤 Arthur E Lindquist
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:20
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/082; F04C2/084; F04C18/00; F04C18/08; F04C18/12; F04C18/123
Claims Analysis
Total Claims: 0
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US2640428A
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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) | 1957-12-20 | 1958-06-21 | 1958-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-12-20 | 1962-06-21 | 1962-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-12-20 | 1966-06-21 | 1966-12-21 | $7700.00 | Window Closed / Lapsed |