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US2728458A
Expired / Lapsed
US
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Filtering cartridge and shield
Assignee: Individual
•
Filing: 1951-08-18
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Granted: 1955-12-27
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Expires: 1971-08-18
Abstract
No abstract record available.
Inventors
- 👤 Charles C Schultz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:19
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USRE23604E
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US1565988A
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US2181608A
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US2066793A
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US2271054A
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US2337238A
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US2347384A
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US2429321A
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US2379582A
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US2487146A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |