Patent US3538020A successfully refreshed from Google Patents.
US3538020A
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Fluid purification device containing a cartridge of polymer entrapped aggregate particles
Assignee: Kata Manufacturing and Filtering Co
•
Filing: 1966-09-23
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Granted: 1970-11-03
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Expires: 1986-09-23
Abstract
No abstract record available.
Inventors
- 👤 Donald Edward Heskett
- 👤 John Barthello Heskett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:23
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/28; B01J20/28014; B01J20/2803; B01J20/28002; B01J20/28004; B01J20/28026; B01J20/28042; Y; Y10; Y10S; Y10S521/00; Y10S521/919; Y10S55/00; Y10S55/13
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US3024207A
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US2975488A
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US3094494A
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US3248339A
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US3381454A
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US3256218A
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US3387940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |