US4221670A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter for liquids
Assignee: Kabelmetal Electro GmbH
•
Filing: 1979-02-12
•
Granted: 1980-09-09
•
Expires: 1999-02-12
Abstract
Abstract The filter is constructed as a cylindrical or tapered body preferably having longitudinal grooves and ridges as flow channels, the body being made of thin metal, preferably gold plated nickel, to be self-supporting and having perforations to obtain a perviousness from 40 to 200 mesh (metric-DIN). A collar is affixed to suspend the filter in an opening. The filter material is preferably be made by electroplating.
Inventors
- 👤 Gerhard Ziemek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 08:12
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/06; A47J31/0626
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
A beverage filter comprising a thin-walled body of hollow construction including a cylindrical or tapered hollow portion, being at least open to one side, the body having a wall and bottom structure, at least a portion thereof being made of thin metal foil and having apertures defining a sieve-like permeability in the range of from 40 metric mesh to 200 metric mesh; the cylindrical or tapered portion being provided with longitudinal grooves and ridges; and a collar, circumscribing the said filter portion and being connected to these ridges to leave flow space along said grooves.
Claim 2
Dependent Claim
95 words
A beverage filter comprising a thin-walled body of hollow construction including a cylindrical or tapered hollow portion, being at least open to one side, the body having a wall and bottom structure, at least a portion thereof being made of thin metal foil and having apertures defining a sieve-like permeability in the range of from 40 metric mesh to 200 metric mesh; the cylindrical or tapered portion being provided with longitudinal grooves and ridges; and a collar, circumscribing the said filter portion and being connected to these ridges to leave flow space along said grooves.
Claim 3
Dependent Claim
20 words
A filter as in claim 1, the wall structure having thickness selected from the range from 0.05 to 0.3 mm.
Claim 4
Dependent Claim
12 words
A filter as in claim 1, the collar being inwardly downwardly tapered.
Claim 5
Dependent Claim
12 words
A filter as in claim 1, the apertures being of polygonal configuration.
Claim 6
Dependent Claim
12 words
A filter as in claim 1, the filter being made of nickel.
Claim 7
Dependent Claim
11 words
A filter as in claim 5, said filter being gold plated.
References Cited (Backward Citations)
US3426910A
Cited
US3458050A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-09 | 1984-03-10 | 1984-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-09 | 1988-03-10 | 1988-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-09 | 1992-03-10 | 1992-09-09 | $7700.00 | Window Closed / Lapsed |