US3426907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Water spray cleaning of multiple spaced wall filter elements
Assignee: Union Carbide Corp
•
Filing: 1967-04-13
•
Granted: 1969-02-11
•
Expires: 1987-04-13
Abstract
No abstract record available.
Inventors
- 👤 Winthrop R Stone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 23:16
CPC Classifications
B; B01; B01D; B01D25/00; B01D25/32; B01D25/38; B01D29/00; B01D29/39; B01D29/62; B01D29/64; B01D29/6438
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2878942A
Cited
US2856236A
Cited
US2868379A
Cited
US2936075A
Cited
US3285417A
Cited
US3344922A
Cited
US3310171A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |