Patent US3468422A successfully refreshed from Google Patents.
US3468422A
Expired / Lapsed
US
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Ceramic filter bottom directly supporting media
Assignee: Chicago Bridge and Iron Co
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Filing: 1967-02-03
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Granted: 1969-09-23
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Expires: 1987-02-03
Abstract
No abstract record available.
Inventors
- 👤 Thomas R Camp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:44
CPC Classifications
B; B01; B01D; B01D24/00; B01D24/46; B01D24/4631; B01D24/4636; B01D24/02; B01D24/10; B01D24/12; B01D2201/00; B01D2201/04; B01D2201/0415; B01D2201/08; B01D2201/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1429477A
Cited
US1871122A
Cited
US2528065A
Cited
US2711829A
Cited
US3110667A
Cited
GB956826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |