US3785162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffusion pump assembly
Assignee: Nokia Inc
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Filing: 1972-12-07
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Granted: 1974-01-15
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Expires: 1992-12-07
Abstract
Abstract Pumping assembly in which the condensation elements for preventing oil from entering the enclosure to be emptied consists of a baffle cooled by conduction coming from a cold source and by a liquid nitrogen trap in communication with a liquid nitrogen receptacle. The cold source of the baffle is incorporated in the wall of the pump body; the liquid nitrogen receptacle is fixed under the pump cover, so that the assembly is easy to dismantle and to clean.
Inventors
- 👤 J Long
- 👤 J Bessot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:46
CPC Classifications
F; F04; F04F; F04F9/00; Y; Y10; Y10S; Y10S55/00; Y10S55/15
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
147 words
A diffusion pump assembly comprising a generally cylindrical body having one open end closed by a cover, a discharge pipe communicating with the interior of said pump body through the side thereof, an oil receptacle within said pump body supported on the bottom thereof, a diffuser supported above said oil receptacle, first and second superimposed condensation elements disposed within said pump body substantially at the level of said discharge pipe, said first condensation element being supported on an annular inset portion of said pump body and including a baffle provided with fins and a protection cap disposed above said diffuser, said second condensation element being supported by said cover above said first condensation element and including a liquid nitrogen trap provided with fins, whereby the disposition and support of the components of the pump assembly enable the extraction of said components by a simple linear upward movement.
Claim 2
Dependent Claim
147 words
A diffusion pump assembly comprising a generally cylindrical body having one open end closed by a cover, a discharge pipe communicating with the interior of said pump body through the side thereof, an oil receptacle within said pump body supported on the bottom thereof, a diffuser supported above said oil receptacle, first and second superimposed condensation elements disposed within said pump body substantially at the level of said discharge pipe, said first condensation element being supported on an annular inset portion of said pump body and including a baffle provided with fins and a protection cap disposed above said diffuser, said second condensation element being supported by said cover above said first condensation element and including a liquid nitrogen trap provided with fins, whereby the disposition and support of the components of the pump assembly enable the extraction of said components by a simple linear upward movement.
Claim 3
Dependent Claim
36 words
A diffusion pump assembly as defined in claim 1 further including a condensation tank associated with said first condensation element and disposed around said pump body against the outer surface of said annular inset portion thereof.
Claim 4
Dependent Claim
78 words
A diffusion pump assembly as defined in claim 2 wherein said condensation tank is fast with the pump body, and in that the thermal connection between the baffle of said first condensation element and said tank is ensured by simple gravity between accurately dressed contacting surfaces of the baffle and the annular inset portion of the pump body contacting said condensation tank, so that the said first condensation element may be dismantled by a simple linear upward movement.
Claim 5
Dependent Claim
57 words
A diffusion pump assembly as defined in claim 3, wherein said fins of said second condensation element are mechanically and thermally connected to a liquid nitrogen tank which is itself mechanically connected to said cover, so that on lifting the cover, the said condensation element is drawn out of said pump body with a linear upward movement.
Claim 6
Dependent Claim
58 words
A diffusion pump assembly as defined in claim 4 wherein said pump body is constituted by two cylindrical components having a common axis, placed one above the other and being connected at the level of the discharge duct by a horizontal circular shoulder forming said annular inset portion which also constitutes the upper part of said condensation tank.
Claim 7
Dependent Claim
64 words
A diffusion pump assembly as defined in claim 5 wherein the fins of said first and second condensation elements are mechanically and thermally connected to respective sets of ribs made of a metal which is a very good heat conductor, and in that the fins are kept in close thermal contact with the corresponding surface of the condensation tank and the nitrogen taNk, respectively.
Claim 8
Dependent Claim
58 words
A diffusion pump assembly as defined in claim 2 wherein said pump body is constituted by two cylindrical components having a common axis, placed one above the other and being connected at the level of the discharge duct by a horizontal circular shoulder forming said annular inset portion which also constitutes the upper part of said condensation tank.
Claim 9
Dependent Claim
64 words
A diffusion pump assembly as defined in claim 4 wherein the fins of said first and second condensation elements are mechanically and thermally connected to respective sets of ribs made of a metal which is a very good heat conductor, and in that the fins are kept in close thermal contact with the corresponding surface of the condensation tank and the nitrogen tank, respectively.
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) | 1977-01-14 | 1977-07-16 | 1978-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-14 | 1981-07-16 | 1982-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-14 | 1985-07-16 | 1986-01-15 | $7700.00 | Window Closed / Lapsed |