US3394067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for unloading filters
Assignee: Baker Petrolite LLC
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Filing: 1964-06-12
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Granted: 1968-07-23
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Expires: 1984-06-12
Abstract
No abstract record available.
Inventors
- 👤 William L Shirley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:18
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/06; D; D06; D06F; D06F43/00; D06F43/08; D06F43/081; D06F43/085
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) | 1971-07-23 | 1972-01-22 | 1972-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-07-23 | 1976-01-22 | 1976-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-07-23 | 1980-01-22 | 1980-07-23 | $7700.00 | Window Closed / Lapsed |