US2622738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-supporting metallic edge type filter unit
Assignee: Purolator Products Inc
•
Filing: 1947-10-31
•
Granted: 1952-12-23
•
Expires: 1967-10-31
Abstract
No abstract record available.
Inventors
- 👤 Julius P Kovacs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:20
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/02; B01D25/00; B01D25/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB191109228A
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US1729197A
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US1824079A
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US2042537A
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US1974235A
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US2146823A
Cited
US2133004A
Cited
GB523919A
Cited
US2271662A
Cited
US2421704A
Cited
US2380111A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-23 | 1956-06-23 | 1956-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-23 | 1960-06-23 | 1960-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-23 | 1964-06-23 | 1964-12-23 | $7700.00 | Window Closed / Lapsed |