Patent US2390212A successfully refreshed from Google Patents.
US2390212A
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US
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Antifoaming agents
Assignee: National Oil Products Co
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Filing: 1942-09-22
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Granted: 1945-12-04
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Expires: 1962-09-22
Abstract
No abstract record available.
Inventors
- 👤 James H Fritz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:52
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/06; D21H21/12; B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; D21H17/00; D21H17/60; D21H17/71
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) | 1948-12-03 | 1949-06-04 | 1949-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1952-12-03 | 1953-06-04 | 1953-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1956-12-03 | 1957-06-04 | 1957-12-04 | $7700.00 | Window Closed / Lapsed |