US2644403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for preventing clogging in centrifugal pumps
Assignee: Ingersoll Rand Co
•
Filing: 1952-03-05
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Granted: 1953-07-07
•
Expires: 1972-03-05
Abstract
No abstract record available.
Inventors
- 👤 Lewis J Dawson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:40
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/165; F04D29/167; F04D7/00; F04D7/02; F04D7/04; F04D7/045
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2050104A
Cited
US2190670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-07-06 | 1957-01-05 | 1957-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-07-06 | 1961-01-05 | 1961-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-07-06 | 1965-01-05 | 1965-07-07 | $7700.00 | Window Closed / Lapsed |