US4024648A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Safety flask for freeze drying
Assignee: Individual
•
Filing: 1975-10-22
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Granted: 1977-05-24
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Expires: 1995-10-22
Abstract
Abstract A safety flask for freeze drying being formed of chemically-resistant and shock-resistant materials, including a container flask, a cover assembly and a tube removably inserted through the cover assembly so as to be in communication with the interior of the container flask for connection to a vacuum source. Sealing means is mounted in the cover assembly to provide a fluid-tight seal between the tube and the cover assembly. A filter is removably mounted on the cover assembly over the point of communication of the tube with the container flask to prevent cross-contamination between samples and to prevent the sample from being withdrawn by the vacuum. A vacuum release device is mounted on the tube to permit easy removal of the flask.
Inventors
- 👤 Charles E. Bender
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:43
CPC Classifications
F; F26; F26B; F26B25/00; F26B25/06; F26B25/14; F26B5/00; F26B5/04; F26B5/06
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
206 words
A vessel assembly for freeze drying formed of materials resistant to chemical, thermal and shock action comprising a sample container open at one end, a cover assembly disposed over said opening said cover assembly having a central opening with a shoulder formed therein in communication with said container a cylindrical adapter disposed in said opening having a central passageway extending therethrough, said adapter having an enlarged head and a reduced bottom portion extending into said central opening and said adapter having a shoulder adjacent its reduced portion resting on said central opening shoulder, recess means on the exterior middle portion of said adapter and sealing means disposed in them to form a seal with said central opening, other recess means on the interior of said passageway with sealing means disposed therein, a connector tube for communication with a vacuum source extending into said passageway adjacent a shoulder formed therein and bearing against sealing means on said passageway shoulder, an annular retainer cap inserted in said central opening, a filter disposed in said cap sandwiched between perforated support means, and vacuum release means inserted through the wall of said connector tube including a threaded member with an o-ring disposed thereon to provide a seal for said opening.
Claim 2
Dependent Claim
206 words
A vessel assembly for freeze drying formed of materials resistant to chemical, thermal and shock action comprising a sample container open at one end, a cover assembly disposed over said opening said cover assembly having a central opening with a shoulder formed therein in communication with said container a cylindrical adapter disposed in said opening having a central passageway extending therethrough, said adapter having an enlarged head and a reduced bottom portion extending into said central opening and said adapter having a shoulder adjacent its reduced portion resting on said central opening shoulder, recess means on the exterior middle portion of said adapter and sealing means disposed in them to form a seal with said central opening, other recess means on the interior of said passageway with sealing means disposed therein, a connector tube for communication with a vacuum source extending into said passageway adjacent a shoulder formed therein and bearing against sealing means on said passageway shoulder, an annular retainer cap inserted in said central opening, a filter disposed in said cap sandwiched between perforated support means, and vacuum release means inserted through the wall of said connector tube including a threaded member with an o-ring disposed thereon to provide a seal for said opening.
Claim 3
Dependent Claim
13 words
The vessel assembly of claim 1 wherein the sample container is high-impact plastic.
Claim 4
Dependent Claim
17 words
The vessel assembly of claim 2 wherein said high-impact plastic forming said sample container is a polycarbonate.
Claim 5
Dependent Claim
17 words
The vessel assembly of claim 2 wherein said high-impact plastic forming said sample container is a polymethylpentene.
Claim 6
Dependent Claim
35 words
The vessel assembly of claim 1 wherein a silicone rubber gasket is disposed between said cover assembly and said sample container, achieving said leakproof manner of attachment of said cover assembly to said sample container.
Claim 7
Dependent Claim
12 words
The vessel assembly of claim 1 wherein said filter means is disposable.
Claim 8
Dependent Claim
15 words
The vessel assembly of claim 1 wherein said connector means is formed of a polycarbonate.
Claim 9
Dependent Claim
15 words
The vessel assembly of claim 1 wherein said connector means is formed of stainless steel.
Claim 10
Dependent Claim
16 words
The vessel assembly of claim 1 said cover assembly and said adapter means are integrally formed.
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) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |