US2830359A
Expired / Lapsed
US
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Method of making a filter element
Assignee: ENGINE LIFE PRODUCTS Corp
•
Filing: 1954-12-02
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Granted: 1958-04-15
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Expires: 1974-12-02
Abstract
No abstract record available.
Inventors
- 👤 John L Reinshagen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:47
CPC Classifications
B; B21; B21D; B21D51/00; B21D53/00; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604; Y10T29/49826; Y10T29/49879; Y10T29/49908; Y10T29/49915; Y10T29/49945
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1446487A
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FR700875A
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US1923267A
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US2031936A
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US1951151A
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US2267126A
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US2550070A
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US2460296A
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US2621796A
Cited
US2543481A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-14 | 1961-10-14 | 1962-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-14 | 1965-10-14 | 1966-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-14 | 1969-10-14 | 1970-04-15 | $7700.00 | Window Closed / Lapsed |