Patent US2921684A successfully refreshed from Google Patents.
US2921684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Whirlpool separator
Assignee: Individual
•
Filing: 1955-10-27
•
Granted: 1960-01-19
•
Expires: 1975-10-27
Abstract
No abstract record available.
Inventors
- 👤 Baker Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:36
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/02; B01D21/24; B01D21/26; B01D21/267
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1271925A
Cited
US1272850A
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US1642206A
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US1820976A
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US1917819A
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US2076529A
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US2259029A
Cited
US2308670A
Cited
US2574685A
Cited
US2703748A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-18 | 1963-07-20 | 1964-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-18 | 1967-07-20 | 1968-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-18 | 1971-07-20 | 1972-01-19 | $7700.00 | Window Closed / Lapsed |