US3524304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bag air-filter
Assignee: Delbag Luftfilter GmbH
•
Filing: 1967-05-29
•
Granted: 1970-08-18
•
Expires: 1987-05-29
Abstract
No abstract record available.
Inventors
- 👤 Hans Joachim Wittemeier
- 👤 Fritz Becker
- 👤 Klaus Peter Deutschmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:13
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/02; B01D46/023; G; G06; G06M; G06M11/00; G06M11/02; G06M11/04; Y; Y10; Y10S; Y10S55/00; Y10S55/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
AU113704B
Cited
US1038223A
Cited
GB555056A
Cited
US2467503A
Cited
US2954873A
Cited
US2853154A
Cited
GB879781A
Cited
US3159862A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-08-17 | 1974-02-16 | 1974-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-08-17 | 1978-02-16 | 1978-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-08-17 | 1982-02-16 | 1982-08-18 | $7700.00 | Window Closed / Lapsed |