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US1849042A
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Assignee: METAFILTERS (1929) Ltd
•
Filing: 1931-04-14
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Granted: 1932-03-08
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Expires: 1951-04-14
Abstract
No abstract record available.
Inventors
- 👤 Pickard Joseph Allen
- 👤 Rogers Frank
- 👤 Mitchell Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:04
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; B01D29/46; B01D25/00; B01D25/12; B01D25/19; B01D25/22; B01D25/26; B01D25/30; B01D25/32; B01D25/38; B01D35/00; B01D35/005; B01D35/14; B01D35/147; B01D35/26
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) | 1935-03-08 | 1935-09-07 | 1936-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-03-08 | 1939-09-07 | 1940-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-03-08 | 1943-09-07 | 1944-03-08 | $7700.00 | Window Closed / Lapsed |