US3494473A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic drum filter with cylinder and end plates
Assignee: Ametek Inc
•
Filing: 1968-11-20
•
Granted: 1970-02-10
•
Expires: 1988-11-20
Abstract
No abstract record available.
Inventors
- 👤 John E Krynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:56
CPC Classifications
B; B01; B01D; B01D33/00; B01D33/06; B01D33/067; B01D33/073; B01D33/09
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3175690A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-09 | 1973-08-11 | 1974-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-09 | 1977-08-11 | 1978-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-09 | 1981-08-11 | 1982-02-10 | $7700.00 | Window Closed / Lapsed |