Patent US1634720A successfully refreshed from Google Patents.
US1634720A
Expired / Lapsed
US
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Apparatus for precipitating and filtering
Assignee: Merrill Co
•
Filing: 1924-05-08
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Granted: 1927-07-05
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Expires: 1944-05-08
Abstract
No abstract record available.
Inventors
- 👤 Louis D Mills
- 👤 Thomas B Crowe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:12
CPC Classifications
B; B01; B01D; B01D37/00; B01D37/02; B01D29/00; B01D29/39; B01D29/41; B01D29/76; B01D29/86; B01D29/88; B01D29/90; B01D29/904
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1930-07-04 | 1931-01-03 | 1931-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1934-07-04 | 1935-01-03 | 1935-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1938-07-04 | 1939-01-03 | 1939-07-05 | $7700.00 | Window Closed / Lapsed |