US3442273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter washing apparatus
Assignee: HARRY W HANISH
•
Filing: 1967-08-31
•
Granted: 1969-05-06
•
Expires: 1987-08-31
Abstract
No abstract record available.
Inventors
- 👤 Harry W Hanish
- 👤 Robert A Steffensmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:12
CPC Classifications
B; B01; B01D; B01D41/00; B01D41/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2624618A
Cited
US2699793A
Cited
US2919704A
Cited
GB797940A
Cited
US2987067A
Cited
US3216429A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-05 | 1972-11-04 | 1973-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-05 | 1976-11-04 | 1977-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-05 | 1980-11-04 | 1981-05-06 | $7700.00 | Window Closed / Lapsed |