US3400519A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High efficiency air filter
Assignee: PAUL P KORN
•
Filing: 1967-01-11
•
Granted: 1968-09-10
•
Expires: 1987-01-11
Abstract
No abstract record available.
Inventors
- 👤 Paul P Korn
- 👤 Korn Lawrence
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:42
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/023
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3124441A
Cited
US1012122A
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US1049789A
Cited
US3160908A
Cited
US3173777A
Cited
US3190059A
Cited
US3208205A
Cited
FR1363326A
Cited
US3276190A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-09-10 | 1972-03-11 | 1972-09-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-09-10 | 1976-03-11 | 1976-09-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-09-10 | 1980-03-11 | 1980-09-10 | $7700.00 | Window Closed / Lapsed |