US2826309A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Edge type filter elements and methods of making the same
Assignee: Purolator Products Inc
•
Filing: 1953-06-26
•
Granted: 1958-03-11
•
Expires: 1973-06-26
Abstract
No abstract record available.
Inventors
- 👤 Herbert L Forman
- 👤 Ronald A Burla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:31
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/114; B01D29/44; B01D29/46; B01D29/48; B01D37/00; B01D37/02; B22; B22F; B22F7/00; B22F7/002; Y; Y10; Y10S; Y10S55/00; Y10S55/05
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1060938A
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US1268274A
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US1673743A
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US2042537A
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US2133004A
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US2408515A
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US2436108A
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US2454982A
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US2622738A
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US2576372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-10 | 1961-09-09 | 1962-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-10 | 1965-09-09 | 1966-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-10 | 1969-09-09 | 1970-03-11 | $7700.00 | Window Closed / Lapsed |