Patent US2664312A successfully refreshed from Google Patents.
US2664312A
Expired / Lapsed
US
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Oil burner filter
Assignee: EDDINGTON METAL SPECIALTY Co
•
Filing: 1950-12-22
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Granted: 1953-12-29
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Expires: 1970-12-22
Abstract
No abstract record available.
Inventors
- 👤 Jr Walter V Czarnecki
- 👤 Casimer M Czarnecki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:22
CPC Classifications
F; F23; F23D; F23D11/00; F23D11/36; F23D11/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1876377A
Cited
US1140758A
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US1335899A
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US1982871A
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US2071920A
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US2145047A
Cited
US2361818A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-28 | 1957-06-29 | 1957-12-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-28 | 1961-06-29 | 1961-12-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-28 | 1965-06-29 | 1965-12-29 | $7700.00 | Window Closed / Lapsed |