Patent US3630007A successfully refreshed from Google Patents.
US3630007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plate-shaped disposable active charcoal filter
Assignee: Delbag Luftfilter GmbH
•
Filing: 1969-03-26
•
Granted: 1971-12-28
•
Expires: 1989-03-26
Abstract
Abstract A disposable active charcoal filter has a frame open at both sides and subdivided into a plurality of compartments by intersecting partitions. The two open sides are covered by gaspermeable sheets and the space between the sheets is filled with active carbon.
Inventors
- 👤 Gerhard Max Neumann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:50
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/30
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
15 words
A filter as defined in claim 1 wherein said compartments have a substantially square outline.
Claim 2
Dependent Claim
15 words
A filter as defined in claim 2 wherein said compartments have a generally cubical volume.
Claim 3
Dependent Claim
14 words
A filter as defined in claim 1 wherein said sheets are flexible fiber mats.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |