Patent US3732734A successfully refreshed from Google Patents.
US3732734A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Micropipette with disposable tips
Assignee: Centaur Chemical Co
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Filing: 1972-05-25
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Granted: 1973-05-15
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Expires: 1992-05-25
Abstract
Abstract A spring loaded plunger actuated vacuum pipette tube is disclosed for use in combination with removable disposable molded plastic tip members wherein a plurality of adjacent concentric internal annular rings are formed within the larger open end of the tip member, and annular rings being of successively decreasing diameter progressing inwardly, for cooperative airtight frictional engagement with a smoothly tapered end surface of the pipette tube. The foregoing abstract is not to be taken either as a complete exposition or as a limitation of the present invention. In order to understand the full nature and extent of the technical disclosure of this application, reference must be had to the following detailed description and the accompanying drawing as well as to the claims.
Inventors
- 👤 S Avakian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:20
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/02; B01L3/0275
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
73 words
The combination of a spring loaded plunger actuated vacuum pipette and a removable disposable plastic tip member comprising a taper formed on the end of the pipette opposite the plunger thereof, and a plurality of adjacent concentric internal ringed ribs of successively decreasing diameter formed on the inner surface of an open end of said plastic tip member, whereby said ringed ribs frictionally engage said tapered end to form an airproof seal therebetween.
Claim 2
Dependent Claim
73 words
The combination of a spring loaded plunger actuated vacuum pipette and a removable disposable plastic tip member comprising a taper formed on the end of the pipette opposite the plunger thereof, and a plurality of adjacent concentric internal ringed ribs of successively decreasing diameter formed on the inner surface of an open end of said plastic tip member, whereby said ringed ribs frictionally engage said tapered end to form an airproof seal therebetween.
Claim 3
Dependent Claim
36 words
The combination of claim 1 wherein the taper formed on the end of said pipette is less than the taper formed between the inner surfaces of the innermost and outermost of said successive internal ringed ribs.
Claim 4
Dependent Claim
29 words
The combination of claim 1 and an outer annular shoulder portion formed on the outer open end of said tip member adjacent to and surrounding said concentric ringed ribs.
Claim 5
Dependent Claim
65 words
For use with a spring loaded plunger actuated vacuum pipette instrument, a detachable and disposable tip member formed of molded plastic in a substantial right cylinder elongated hollow cone, having an outer annular ring portion formed around its larger open end and at least one elastically deformable annular inner ringed rib formed within said larger open end and concentric with the axis of said cone.
Claim 6
Dependent Claim
65 words
For use with a spring loaded plunger actuated vacuum pipette instrument, a detachable and disposable tip member formed of molded plastic in a substantial right cylinder elongated hollow cone, having an outer annular ring portion formed around its larger open end and at least one elastically deformable annular inner ringed rib formed within said larger open end and concentric with the axis of said cone.
Claim 7
Dependent Claim
43 words
The combinatiOn of claim 4 including a plurality of adjacent annular ringed ribs formed on the inner conical surface of said tip member within the larger open end thereof, said annular ringed ribs being of progressively decreasing diameter inwardly from said open end.
Claim 8
Dependent Claim
47 words
The combination of claim 5 wherein the diameters of said adjacent annular ringed ribs decreases progressively in such manner that a conical surface tangential to the inner surfaces of all said annular ribs forms a greater taper than that of a pipette instrument adapted for insertion therein.
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) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |