US2981416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the cleaning of filtering equipment
Assignee: General Filter Co
•
Filing: 1957-10-23
•
Granted: 1961-04-25
•
Expires: 1977-10-23
Abstract
No abstract record available.
Inventors
- 👤 Joseph P Lawlor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:00
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/114; B01D29/13; B01D29/15; B01D29/50; B01D29/52; B01D29/54; B01D29/62; B01D29/66; B01D2201/00; B01D2201/04; B01D2201/0469; B01D2201/0476; B01D37/00; B01D37/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US581324A
Cited
GB189421681A
Cited
US654592A
Cited
US2035592A
Cited
US2300789A
Cited
US2405838A
Cited
US2494143A
Cited
US2693882A
Cited
US2748950A
Cited
US2784846A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |