Patent US1921220A successfully refreshed from Google Patents.
US1921220A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Conditioner and agitator
Assignee: Individual
•
Filing: 1927-08-08
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Granted: 1933-08-08
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Expires: 1947-08-08
Abstract
No abstract record available.
Inventors
- 👤 Arthur C Daman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:31
CPC Classifications
B; B03; B03D; B03D1/00; B03D1/14; B03D1/16; B03D1/02; B03D1/028; B03D1/20; B03D1/24; B03D1/247
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) | 1936-08-07 | 1937-02-06 | 1937-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1940-08-07 | 1941-02-06 | 1941-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1944-08-07 | 1945-02-06 | 1945-08-08 | $7700.00 | Window Closed / Lapsed |