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US3438504A
Expired / Lapsed
US
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Filter element and method of production
Assignee: General Electric Co
•
Filing: 1966-08-11
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Granted: 1969-04-15
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Expires: 1986-08-11
Abstract
No abstract record available.
Inventors
- 👤 Sydney C Furman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:08
CPC Classifications
G; G21; G21K; G21K5/00; Y; Y10; Y10S; Y10S264/00; Y10S264/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2267752A
Cited
US2345080A
Cited
US3096704A
Cited
US3303085A
Cited
US3303254A
Cited
US3348022A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |