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US2940644A
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Assignee: INDIANA COMMERCIAL FILTERS COR
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Filing: 1957-07-22
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Granted: 1960-06-14
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Expires: 1977-07-22
Abstract
No abstract record available.
Inventors
- 👤 William A Crane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:34
CPC Classifications
G; G01; G01F; G01F13/00; G01F13/001; B; B01; B01J; B01J4/00; B01J4/02; C; C02; C02F; C02F1/00; C02F1/68; C02F1/685; C02F1/687
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-06-14 | 1963-12-14 | 1964-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-14 | 1967-12-14 | 1968-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-14 | 1971-12-14 | 1972-06-14 | $7700.00 | Window Closed / Lapsed |