US4390500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary evaporator shaft
Assignee: United States, AS REPRESENTED BY DEPARTMENT OF JUSTICE
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Filing: 1981-09-25
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Granted: 1983-06-28
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Expires: 2001-09-25
Abstract
Abstract A rotary evaporator shaft having tapered coupling surfaces for coupling to a rotary drive and to a container includes an extracting device disposed between the tapered coupling joints and moveable into engagement with a selected one of the container or the drive means for extracting the coupling therefrom with the shaft constructed of a synthetic resin polymer such as that sold under the trademark TEFLON.
Inventors
- 👤 Robert J. Miskinis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:11
CPC Classifications
B; B01; B01L; B01L3/00; B01L3/56; B01L3/565; B01D; B01D1/00; B01D1/30; B01D3/00; B01D3/08; B01D3/085; Y; Y10; Y10T; Y10T29/00; Y10T29/53; Y10T29/5367; Y10T29/53796; Y10T29/53848
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
120 words
A joint extractor assembly for separating male to female, ground glass to polymer resin, joints having standard tapers comprising in combination: a polymer resin hollow cylindrical member having two spaced apart end tapered male joint surfaces and an intermediate threaded portion; said tapered joints being tapered outwardly from the intermediate threaded portion respectively to engage complementary tapered female surfaces of members to be joined; an extractor nut threadedly mounted, and axially movable in either direction, on the intermediate threaded portion of the cylindrical member; said extractor nut being dimensioned to initially engage an end of either female member for applying an axially force on said female members to enable the male members to be withdrawn from their respective female member.
Claim 2
Dependent Claim
120 words
A joint extractor assembly for separating male to female, ground glass to polymer resin, joints having standard tapers comprising in combination: a polymer resin hollow cylindrical member having two spaced apart end tapered male joint surfaces and an intermediate threaded portion; said tapered joints being tapered outwardly from the intermediate threaded portion respectively to engage complementary tapered female surfaces of members to be joined; an extractor nut threadedly mounted, and axially movable in either direction, on the intermediate threaded portion of the cylindrical member; said extractor nut being dimensioned to initially engage an end of either female member for applying an axially force on said female members to enable the male members to be withdrawn from their respective female member.
Claim 3
Dependent Claim
47 words
The joint extractor assembly of claim 1 wherein: said polymer resin joint member is a rotary evaporation shaft having a co-axial bore therethrough; one of said joint surfaces is a glass flask connecting joint; and the other of said joint surfaces is a rotary drive coupling joint.
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) | 1986-06-27 | 1986-12-27 | 1987-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-27 | 1990-12-27 | 1991-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-27 | 1994-12-27 | 1995-06-28 | $7700.00 | Window Closed / Lapsed |