Patent US5192283A successfully refreshed from Google Patents.
US2799357A
Expired / Lapsed
US
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Gas filter
Assignee: Elster Kromschroeder GmbH
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Filing: 1954-12-14
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Granted: 1957-07-16
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Expires: 1974-12-14
Abstract
No abstract record available.
Inventors
- 👤 Warnecke Wilhelm
- 👤 Rings Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:41
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-15 | 1961-01-14 | 1961-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-15 | 1965-01-14 | 1965-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-15 | 1969-01-14 | 1969-07-16 | $7700.00 | Window Closed / Lapsed |