Patent US3861872A successfully refreshed from Google Patents.
US3861872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam sterilizer
Assignee: MDT Corp
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Filing: 1973-04-02
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Granted: 1975-01-21
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Expires: 1993-04-02
Abstract
Abstract In a steam sterilizer of the self-contained, single shell, steam generating type, the interior surface of the chamber is roughened (as by sandblasting) to prevent the formation of water droplets, during cool-down, on all interior surfaces located above the load, to prevent water from dripping onto the load and thus to minimize the amount of moisture absorbed by the load during the sterilization process.
Inventors
- 👤 Roderick T Macfarlane
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 13:04
CPC Classifications
A; A61; A61L; A61L2/00; A61L2/02; A61L2/04; A61L2/06; A61L2/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
15 words
The apparatus according to claim 1 wherein said vessel is cylindrical with a horizontal axis.
Claim 2
Dependent Claim
19 words
The apparatus according to claim 1 wherein said entire interior surface of at least said upper area is uniform.
Claim 3
Dependent Claim
72 words
In a self-contained, single shell, steam generating sterilizer including a sterilizing vessel having a sterilizing chamber therein, and a fan adjacent the vessel for cooling the outside surface of the vessel, the improvement comprising: a. said vessel being cylindrical with a horizontal axis; b. the interior surface of an upper area of said vessel, overlying substantially all load-containing areas of said chamber, having a surface roughness between about 250 and 300 microinches.
Claim 4
Dependent Claim
107 words
In the method of reducing load absorption of water during cool-down while sterilizing a load in a self contained, single shell, steam generating sterilizer including a cylindrical sterilizing vessel having a sterilizing chamber therein and means for cooling the outside surface of the vessel, the improvement comprising: a. providing the interior surface of an upper area of said vessel, overlying substantially all load-containing areas of said chamber, with a surface roughness greater than 50 microinches, such that the formation thereon, from condensate, of water droplets, is less than that which would occur under the same conditions on a surface having a roughness of less than 50 microinches.
Claim 5
Dependent Claim
19 words
The method according to claim 5 wherein said providing step comprising providing said roughness over only said upper area.
Claim 6
Dependent Claim
21 words
The method according to claim 5 wherein said providing step comprises providing said roughness in the range of about 250-300 microinches.
Claim 7
Dependent Claim
19 words
The method according to claim 5 wherein said entire interior surface of at least said upper area is uniform.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-01-20 | 1978-07-22 | 1979-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-20 | 1982-07-22 | 1983-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-20 | 1986-07-22 | 1987-01-21 | $7700.00 | Window Closed / Lapsed |