US4876450A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cryosonde for well logging tool
Assignee: Atlantic Richfield Co
•
Filing: 1988-07-26
•
Granted: 1989-10-24
•
Expires: 2008-07-26
Abstract
Abstract A cryosonde for a logging tool wherein the refrigerant chamber for cooling the germanium crystal detector has an easily replaceable rupture means which will fail before the chamber, itself, will rupture.
Inventors
- 👤 Melvin G. Montgomery
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 15:08
CPC Classifications
F; F17; F17C; F17C3/00; F17C3/02; F17C3/08; F17C3/085; E; E21; E21B; E21B47/00; E21B47/01; E21B47/017; E21B47/0175; F25; F25B; F25B19/00; F25D; F25D19/00; F25D19/006; F25D3/00; G; G01; G01V; G01V5/00; G01V5/04; F17C2201/00; F17C2201/01; F17C2201/0104; F17C2201/0119; F17C2203/00; F17C2203/03; F17C2203/0391; F17C2203/06; F17C2203/0602; F17C2203/0612; F17C2203/0626; F17C2203/0629; F17C2205/00; F17C2205/03; F17C2205/0302; F17C2205/0311; F17C2205/0341; F17C2209/00; F17C2209/22; F17C2209/228; F17C2221/00; F17C2221/03; F17C2221/038; F17C2223/00; F17C2223/01; F17C2223/0146; F17C2223/0153; F17C2223/0161
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
A cryosonde comprising: a housing; a germanium crystal in said housing; and a means for cooling said crystal comprising: a refrigerant chamber in said housing in thermal communication with said crystal; means to fill said chamber with a refrigerant; and rupture means in communication with the interior of said chamber adapted to rupture at a pressure less than the pressure required to rupture said chamber.
Claim 2
Dependent Claim
65 words
A cryosonde comprising: a housing; a germanium crystal in said housing; and a means for cooling said crystal comprising: a refrigerant chamber in said housing in thermal communication with said crystal; means to fill said chamber with a refrigerant; and rupture means in communication with the interior of said chamber adapted to rupture at a pressure less than the pressure required to rupture said chamber.
Claim 3
Dependent Claim
58 words
The cryosonde of claim 1 wherein said rupture means comprises: a plug removable mounted in said chamber and having a bore therethrough fluidly communicating the interior and exterior of said chamber; and a replaceable sealing membrane covering said bore in said plug and adapted to rupture at a pressure less than the pressure required to rupture said chamber.
Claim 4
Dependent Claim
14 words
The cryosonde of claim 2 wherein said sealing membrane is comprised of aluminum foil.
Claim 5
Dependent Claim
50 words
The cryosonde of claim 2 incluing: a tube opening into said chamber for filling said chamber with refrigerant and for venting said chamber after filling; and a filter positioned over the opening of said tube whereby any fluid flowing into or out of said tube must flow through said filter.
Claim 6
Dependent Claim
80 words
The cryosonde of claim 2 including: a sleeve positioned between said chamber and said housing, said sleeve forming a first annulus between said sleeve and said housing and a second annulus between said sleeve and said housing; a filler cap closing the upper end of said sleeve; a cyrogenic filler tube through said filler cap for flowing a cryogenic fluid into said first annulus to freeze refrigerant in said chamber; and means to establish a vacuum in said second annulus.
Claim 7
Dependent Claim
26 words
The cryosonde of claim 5 wherein said rupture means on said chamber is positioned so that it can be removed and replaced through said filler tube.
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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |