Patent US2843050A successfully refreshed from Google Patents.
US2843050A
Expired / Lapsed
US
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Diaphragm sludge or chemical pump
Assignee: Individual
•
Filing: 1954-02-15
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Granted: 1958-07-15
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Expires: 1974-02-15
Abstract
No abstract record available.
Inventors
- 👤 Lyndus E Harper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 09:24
CPC Classifications
F; F01; F01L; F01L25/00; F01L25/08; B; B60; B60T; B60T11/00; B60T11/10; F04; F04B; F04B43/00; F04B43/02; F04B43/06; F04B43/073; F04B43/0733
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US491116A
Cited
US2151057A
Cited
US2260306A
Cited
US2308974A
Cited
US2321423A
Cited
GB681139A
Cited
US2653552A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-07-14 | 1962-01-13 | 1962-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-14 | 1966-01-13 | 1966-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-14 | 1970-01-13 | 1970-07-15 | $7700.00 | Window Closed / Lapsed |