Patent US2835389A successfully refreshed from Google Patents.
US2835389A
Expired / Lapsed
US
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Diatomite filter unit
Assignee: Individual
•
Filing: 1955-06-22
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Granted: 1958-05-20
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Expires: 1975-06-22
Abstract
No abstract record available.
Inventors
- 👤 William C Sharp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:07
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/31; B01D29/33; B01D29/50; B01D29/52; B01D29/62; B01D29/66; B01D29/668; B01D29/96; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2271814A
Cited
US2562699A
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US2570132A
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US2600458A
Cited
US2709525A
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US2742158A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |