Patent US2213907A successfully refreshed from Google Patents.
US2213907A
Expired / Lapsed
US
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Method of precipitation
Assignee: EIDP Inc
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Filing: 1939-12-02
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Granted: 1940-09-03
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Expires: 1959-12-02
Abstract
No abstract record available.
Inventors
- 👤 Raymond H Fleckenstein
- 👤 Albert T Mertes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:36
CPC Classifications
C; C09; C09C; C09C1/00; B; B01; B01J; B01J19/00; B01J19/26; B01J2208/00; B01J2208/00008; B01J2208/00548; B01J2208/00592; B01J2208/00654; B01J2208/00672; C01; C01P; C01P2004/00; C01P2004/50; C01P2006/00; C01P2006/19
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) | 1943-09-03 | 1944-03-04 | 1944-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-09-03 | 1948-03-04 | 1948-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-09-03 | 1952-03-04 | 1952-09-03 | $7700.00 | Window Closed / Lapsed |