Patent US2049870A successfully refreshed from Google Patents.
US2049870A
Expired / Lapsed
US
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Sifting structure
Assignee: JH Day Co
•
Filing: 1934-04-11
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Granted: 1936-08-04
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Expires: 1954-04-11
Abstract
No abstract record available.
Inventors
- 👤 Schiff Sigmund
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:03
CPC Classifications
B; B07; B07B; B07B1/00; B07B1/28; B07B1/30; Y; Y10; Y10T; Y10T74/00; Y10T74/18; Y10T74/18056; Y10T74/18176
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) | 1939-08-04 | 1940-02-03 | 1940-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-08-04 | 1944-02-03 | 1944-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-08-04 | 1948-02-03 | 1948-08-04 | $7700.00 | Window Closed / Lapsed |