US2424751A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for pumping
Assignee: EIDP Inc
•
Filing: 1942-03-21
•
Granted: 1947-07-29
•
Expires: 1962-03-21
Abstract
No abstract record available.
Inventors
- 👤 Heckert Winfield Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:06
CPC Classifications
B; B01; B01F; B01F25/00; B01F25/60; B01F25/62; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1272212A
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US1357947A
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US1357946A
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US1837446A
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US1799237A
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US1863160A
Cited
US2168187A
Cited
US2212994A
Cited
US2230255A
Cited
US2212598A
Cited
US2281767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-07-28 | 1951-01-27 | 1951-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-28 | 1955-01-27 | 1955-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-28 | 1959-01-27 | 1959-07-29 | $7700.00 | Window Closed / Lapsed |