US3768440A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stain system for membrane filters
Assignee: GAM RAD
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Filing: 1972-07-25
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Granted: 1973-10-30
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Expires: 1992-07-25
Abstract
Abstract A stain system for staining membrane filters including a stain basket for securely holding and carrying a plurality of membrane filters each supported in a filter assembly which provides substantial circumferential support for the filters and which is of a simple two piece construction which can be easily assembled and taken apart.
Inventors
- 👤 P Doman
- 👤 R Wilkie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:35
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/28; G01N1/30; G01N1/31; G01N2001/315; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/53613; Y10T29/5363
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
144 words
In a system for retaining tissue or the like comprising: a disk-like filter for carrying said tissue; a disk-like annular support member having a circular recessed portion for completely receiving the filter and tissue thereon; a relatively narrow inwardly extending flange disposed about one end of said recessed portion for seating said filter; a relatively narrow, interference fit, split ring element received entirely within said recess to retain the filter against said flange; and said element having a radial width larger than that of said flange; whereby said retained filter and tissue can be selectively exposed to treating fluids and whereby the portion of said retainer element extending beyond said flange provides a sufficiently firm support for removal of the tissue carrying filter, from the recessed portion, by a forcing member acting on the filter area aligned with said portion of the retainer element.
Claim 2
Dependent Claim
144 words
In a system for retaining tissue or the like comprising: a disk-like filter for carrying said tissue; a disk-like annular support member having a circular recessed portion for completely receiving the filter and tissue thereon; a relatively narrow inwardly extending flange disposed about one end of said recessed portion for seating said filter; a relatively narrow, interference fit, split ring element received entirely within said recess to retain the filter against said flange; and said element having a radial width larger than that of said flange; whereby said retained filter and tissue can be selectively exposed to treating fluids and whereby the portion of said retainer element extending beyond said flange provides a sufficiently firm support for removal of the tissue carrying filter, from the recessed portion, by a forcing member acting on the filter area aligned with said portion of the retainer element.
Claim 3
Dependent Claim
22 words
The apparatus of claim 1 wherein the radial width of said flange is 0.125 inch and the recess diameter is 1.850 inches.
Claim 4
Dependent Claim
20 words
The apparatus of claim 2 wherein said disk-like member includes a radially extending flange element about the outer periphery thereof.
Claim 5
Dependent Claim
14 words
The apparatus of claim 3 wherein the disk-like member is circular in peripheral configuration.
Claim 6
Dependent Claim
14 words
The apparatus of claim 3 wherein the disk-like member is rectangular in peripheral configuration.
Claim 7
Dependent Claim
35 words
The apparatus of claim 1 in combination with a forcing tool having a peripheral portion adapted to overlie said aligned filter area whereby the filter and tissue therewith may be removed from said recessed portion.
Claim 8
Dependent Claim
101 words
The apparatus of claim 1 in combination with a basket means for supporting a plurality of said disk-like mEmbers for simultaneously treating the filters therewith, said basket comprising: an open frame means; at least one pair of spaced upper rails and one pair of spaced lower rails supported within said frame and generally parallel to one another; each rail including consecutive, inwardly opening slots; and said slots being in associated alignment and of a dimension whereby each opposed pairs of slots slidingly receives a peripheral portion of, and retains in a predetermined vertical position, one of said plurality of disk-like members.
Claim 9
Dependent Claim
28 words
The apparatus of claim 7 wherein said lower rails are closer to one another than the upper rails and provide the bottom support surface for said disk-like members.
Claim 10
Dependent Claim
55 words
The apparatus of claim 7 wherein each lower rail is in vertical alignment with the corresponding upper rail and is disposed at an intermediate vertical section of said frame; The frame is provided with at least an additional rail element at the bottom thereof; and said disk-like members are supported on said additional rail element.
Claim 11
Dependent Claim
30 words
The apparatus of claim 7 wherein the frame is compartmented and each compartment includes said pairs of upper and lower rails to each support a plurality of said disk-like members.
Claim 12
Dependent Claim
32 words
The apparatus of claim 7 including arm elements extending from opposite ends of said frame and adapted to be associated with holder means whereby the basket may be manipulated in said system.
Claim 13
Dependent Claim
18 words
The apparatus of claim 11 wherein handle means are affixed to said arms whereby to manipulate said basket.
Claim 14
Dependent Claim
37 words
The apparatus of claim 11 including two of said arms at opposite ends of one of said end frame structures and one of said arms being generally centrally located at the other of said end frame structures.
Claim 15
Dependent Claim
22 words
The apparatus of claim 13 having a tab element extending away from said basket at the terminus of each of said arms.
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) | 1976-10-29 | 1977-04-30 | 1977-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-29 | 1981-04-30 | 1981-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-29 | 1985-04-30 | 1985-10-30 | $7700.00 | Window Closed / Lapsed |