Patent US3303636A successfully refreshed from Google Patents.
US3303636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cleaning arrangement for filter tubes
Assignee: Standard Filterbau GmbH
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Filing: 1963-07-16
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Granted: 1967-02-14
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Expires: 1983-07-16
Abstract
No abstract record available.
Inventors
- 👤 Liel Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:11
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/04; B01D46/66; B01D46/70; B01D46/71
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2511817A
Cited
US3126913A
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US2496209A
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US2495635A
Cited
US2751042A
Cited
US2861649A
Cited
US2885028A
Cited
US3173776A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-13 | 1970-08-15 | 1971-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-13 | 1974-08-15 | 1975-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-13 | 1978-08-15 | 1979-02-14 | $7700.00 | Window Closed / Lapsed |