Patent US1839430A successfully refreshed from Google Patents.
US1839430A
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Assignee: Dorr Co
•
Filing: 1929-06-20
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Granted: 1932-01-05
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Expires: 1949-06-20
Abstract
No abstract record available.
Inventors
- 👤 William C Weber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 12:02
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/10; B01D21/12; B01D21/14; B01D21/0003; B01D21/003; B01D21/18; B01D21/186; B01D21/24; B01D21/2405; B01D21/2427; B01D21/245; Y; Y10; Y10T; Y10T137/00; Y10T137/4673; Y10T137/479
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) | 1935-01-04 | 1935-07-06 | 1936-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-01-04 | 1939-07-06 | 1940-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-01-04 | 1943-07-06 | 1944-01-05 | $7700.00 | Window Closed / Lapsed |