US3608736A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration unit
Assignee: PII EVERGREEN LLC
•
Filing: 1969-12-19
•
Granted: 1971-09-28
•
Expires: 1989-12-19
Abstract
Abstract A disposable filtration unit for use with a specimen tube, including a hollow cylindrical filter column formed with a cap depending from the bottom of the column and dimensioned to fit the mouth of the specimen tube, the bottom of the column being formed with a depending discharge tip spaced axially centrally of the cap. The bottom of the filter column is formed with flat marginal portions and filter material is utilized in a form including flat sheet portions supported flush on the marginal filter column portions. The sample tube is formed with an exterior annular ridge spaced from its mouth and the cap is sized so as to engage the ridge to thereby space the bottom of the filter column from the mouth. One or more vent openings are defined in the cap between the sample tube mouth and the bottom of the filter column.
Inventors
- 👤 Johnson N S Wong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:06
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/50; B01L3/508; B01L3/5082; A; A61; A61B; A61B5/00; A61B5/15; A61B5/150007; A61B5/150755; B01D; B01D35/00; A61B5/150206; A61B5/150259; A61B5/150351
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
124 words
A disposable filtration unit, comprising: a one-piece hollow body formed with a lower end wall for supporting filter material internally of said body, said wall for supporting filter material internally of said body, said end wall formed with at least one liquid discharge opening and formed externally of said body with a dependent cap, said body having a sidewall defining a filtration column, for containing liquid to be filtered in direct contact with said sidewall, and having an internal vertical dimension from said end wall at least as great as the longest horizontal dimension of said body; filter material on said end wall comprising flat sheet portions directly supported flush on said end wall; and at least one opening defined through said cap wall.
Claim 2
Dependent Claim
124 words
A disposable filtration unit, comprising: a one-piece hollow body formed with a lower end wall for supporting filter material internally of said body, said wall for supporting filter material internally of said body, said end wall formed with at least one liquid discharge opening and formed externally of said body with a dependent cap, said body having a sidewall defining a filtration column, for containing liquid to be filtered in direct contact with said sidewall, and having an internal vertical dimension from said end wall at least as great as the longest horizontal dimension of said body; filter material on said end wall comprising flat sheet portions directly supported flush on said end wall; and at least one opening defined through said cap wall.
Claim 3
Dependent Claim
23 words
The invention according to claim 1 in which said end wall is formed with a epending discharge tip defining said liquid discharge opening.
Claim 4
Dependent Claim
36 words
The invention according to claim 1 including a specimen tube having a cylindrical top portion defining a mouth therefor, said cap being defined by a cylindrical wall to friction fit the mouth of said specimen tube.
Claim 5
Dependent Claim
30 words
The invention according to claim 1 in which said end wall is formed with a depending discharge tip defining said liquid discharge opening and spaced axially centrally of said cap.
Claim 6
Dependent Claim
46 words
The invention according to claim 1 including a specimen tube having a cylindrical top portion defining a mouth therefor and an exterior annular ridge spaced from its mouth, said cap being formed to engage said annular ridge to thereby space said end wall from said mouth.
Claim 7
Dependent Claim
19 words
The invention according to claim 1 in which said filtration column is in the form of an elongate cylinder.
Claim 8
Dependent Claim
130 words
A disposable filtration unit comprising: a one-piece hollow body formed with a lower end wall for supporting filter material internally of said body, the filter supporting surface of said end wall being substantially free from vertical protuberance, said end wall formed with at least one liquid discharge opening and formed externally of said body with a dependent cap, said body having a sidewall defining a filtration column, for containing liquid to be filtered in direct contact with said sidewall, and having an internal vertical dimension from said end wall at least as great as the longest internal horizontal dimension of said body; filter material on said end wall in direct intimate contact with the filter supporting surface of said end wall; at least one opening defined through said cap wall.
Claim 9
Dependent Claim
130 words
A disposable filtration unit comprising: a one-piece hollow body formed with a lower end wall for supporting filter material internally of said body, the filter supporting surface of said end wall being substantially free from vertical protuberance, said end wall formed with at least one liquid discharge opening and formed externally of said body with a dependent cap, said body having a sidewall defining a filtration column, for containing liquid to be filtered in direct contact with said sidewall, and having an internal vertical dimension from said end wall at least as great as the longest internal horizontal dimension of said body; filter material on said end wall in direct intimate contact with the filter supporting surface of said end wall; at least one opening defined through said cap wall.
Claim 10
Dependent Claim
22 words
The invention according to claim 7 in which said filter material comprises filter paper having only minor extent along said vertical dimension.
Claim 11
Dependent Claim
22 words
The invention according to calim 7 in which said filter material comprises flat sheet portions directly supported flush on said end wall.
Claim 12
Dependent Claim
22 words
The invention according to calim 7 in which said filter material comprises flat sheet portions directly supported flush on said end wall.
References Cited (Backward Citations)
US3010583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-27 | 1975-03-29 | 1975-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-27 | 1979-03-29 | 1979-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-27 | 1983-03-29 | 1983-09-28 | $7700.00 | Window Closed / Lapsed |