US3764017A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infusion filter
Assignee: INT TRAVEL AND TRANSPORTATION CO
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Filing: 1971-08-12
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Granted: 1973-10-09
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Expires: 1991-08-12
Abstract
Abstract An improved infusion filter is provided. The filter includes a main single open-ended frusto-conical chamber, an annular ledge integral with the closed end of the chamber at the end having the smaller diameter, a depending, auxiliary cylindrical chamber integral with the ledge and depending from the main chamber, the auxiliary cylindrical chamber having a perforated main bottom to which is fixed a filter disc, the auxiliary chamber being of smaller diameter than the main chamber, and a perforated retaining disc mounted within the main chamber adjacent the auxiliary chamber. The improvement resides in providing the retaining disc with a central, depressed portion which is adapted, prior to infusion use of the filtering device, to be disposed within the auxiliary cylindrical chamber to retain the infusion material therein, and during infusion use, to be disposed mainly in the main chamber.
Inventors
- 👤 J Dover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:57
CPC Classifications
A; A47; A47J; A47J31/00; A47J31/02; B; B65; B65D; B65D85/00; B65D85/70; B65D85/804; B65D85/8043; B65D85/8061
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
183 words
In an infusion filter including a main single open-ended frusto-conical chamber, an annular ledge integral with the closed end of said chamber at the end having the smaller diameter, a depending, auxiliary cylindrical chamber integral with said ledge and depending from said main chamber, said auxiliary cylindrical chamber having a perforated main bottom to which is fixed a filter disc, the auxiliary chamber being of smaller diameter than said main chamber, and a perforated retaining disc mounted within said main chamber adjacent said auxiliary chamber, the improvement comprising: providing said retaining disc with a central depressed portion of slightly less diameter than the diameter of said depending auxiliary cylindrical chamber and adapted, prior to infusion use of said filtering device, to be disposed in force-fit contact within said auxiliary cylindrical chamber, the bottom of said central depressed portion being in contact with said infusion material to retain said infusion material in said auxiliary cylindrical chamber and said central depressed portion during infusion use being forced upwardly and raised out of said depending auxiliary cylindrical chamber to be disposed mainly in said main chamber.
Claim 2
Dependent Claim
183 words
In an infusion filter including a main single open-ended frusto-conical chamber, an annular ledge integral with the closed end of said chamber at the end having the smaller diameter, a depending, auxiliary cylindrical chamber integral with said ledge and depending from said main chamber, said auxiliary cylindrical chamber having a perforated main bottom to which is fixed a filter disc, the auxiliary chamber being of smaller diameter than said main chamber, and a perforated retaining disc mounted within said main chamber adjacent said auxiliary chamber, the improvement comprising: providing said retaining disc with a central depressed portion of slightly less diameter than the diameter of said depending auxiliary cylindrical chamber and adapted, prior to infusion use of said filtering device, to be disposed in force-fit contact within said auxiliary cylindrical chamber, the bottom of said central depressed portion being in contact with said infusion material to retain said infusion material in said auxiliary cylindrical chamber and said central depressed portion during infusion use being forced upwardly and raised out of said depending auxiliary cylindrical chamber to be disposed mainly in said main chamber.
Claim 3
Dependent Claim
21 words
The infusion filter of claim 1 wherein the central depressed portion of the retaining disc is provided with a porous bottom.
Claim 4
Dependent Claim
23 words
The infusion filter of claim 2 wherein the retaining disc is initially of concave cross-section, and during use, flexes to a convex cross-section.
Claim 5
Dependent Claim
22 words
The infusion filter of claim 2 wherein the retaining disc is secured to the annular ledge by removable push pins or screws.
Claim 6
Dependent Claim
41 words
The infusion filter of claim 2 wherein the retaining disc is secured to the filter by a horizontal circumferential inset valley or projecting ridge or a plurality of projecting pins in the interior circumferential side walls, spaced above the annular ledge.
Claim 7
Dependent Claim
34 words
The infusion filter of claim 2 wherein the retaining disc is secured to the filter by a plurality of partial cylindrical walls upstanding from the ledge and cooperating circumferential slits in the retaining disc.
Claim 8
Dependent Claim
41 words
The infusion filter of claim 2 wherein the retaining disc is secured to the filter by a circumferential wall with overhanging lips upstanding from the annular ledge and cooperating downwardly depending flanges on the retaining disc, to provide a snap-on fit.
Claim 9
Dependent Claim
50 words
The infusion filter of claim 2 wherein the retaining disc is secured to the filter by a plurality of radially inwardly projecting pins on the circumferential walls of the depending cylindrical chamber, cooperating with vertical circumferential slits in the circumferential wall of the central depressed area of the retaining disc.
Claim 10
Dependent Claim
34 words
The infusion filter of claim 2 wherein the retaining disc is provided with an open-ended cylindrical wall depending from the central depressed portion, the wall being provided with a plurality of access vertical slits.
Claim 11
Dependent Claim
50 words
The infusion filter of claim 2 wherein the retaining disc is provided with an open-ended cylindrical wall depending from the central depressed portion, the wall being provided with a plurality of access vertical slits and wherein The disc is secured to the annular ledge by removable push pins or screws.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |