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US2729335A
Expired / Lapsed
US
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Clarifiers
Assignee: Individual
•
Filing: 1951-10-17
•
Granted: 1956-01-03
•
Expires: 1971-10-17
Abstract
No abstract record available.
Inventors
- 👤 Estrada Rafael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:11
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/02; B01D21/04; B01D21/06; B01D21/003; B01D21/0036; B01D21/24; B01D21/2427
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1135997A
Cited
US1480379A
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US1770353A
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US2003357A
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US2195739A
Cited
US2402649A
Cited
US2276300A
Cited
US2253878A
Cited
US2340132A
Cited
US2488851A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-02 | 1959-07-04 | 1960-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-02 | 1963-07-04 | 1964-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-02 | 1967-07-04 | 1968-01-03 | $7700.00 | Window Closed / Lapsed |