US3967489A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming constriction in tubing
Assignee: General Electric Co
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Filing: 1975-05-15
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Granted: 1976-07-06
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Expires: 1995-05-15
Abstract
Abstract The present invention provides a method of forming a flow restriction in a tube to be used as a capillary in a refrigeration system. The method includes shaping the tube longitudinally to a preselected configuration, and then squeezing a section of the tube while directing a fluid therethrough until the fluid reaches a preselected pressure.
Inventors
- 👤 Walter John Pohl
- 👤 Roy W. Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:34
CPC Classifications
B; B21; B21D; B21D53/00; B21D53/02; B21C; B21C37/00; B21C37/06; B21C37/15; B21D41/00; B21D41/04; B21D41/045; F; F25; F25B; F25B41/00; F25B41/30; F25B41/37; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/4935; Y10T29/49359
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
158 words
The method of forming a capillary tube for connection into a refrigeration system which comprises: forming a length of tubing longitudinally into a preselected configuration so that the free ends thereof are arranged to connect with said refrigeration system, including at least one portion intermediate said ends being in a single plane; placing said portion of said tubing intermediate said free ends in a forming means; connecting at least one of said free ends to a source of constant pressure through a control means having means for measuring said pressure passing through said tubing; squeezing said portion of the tubing in the forming means at a first speed until the tubing reaches an intermediate predetermined restriction; then squeezing said portion of tubing at a second slower speed until the tubing restriction causes the medium passing through said tubing to reach a final predetermined pressure; and terminating said second squeezing operation when said measuring means indicates said predetermined pressure.
Claim 2
Independent Claim
158 words
The method of forming a capillary tube for connection into a refrigeration system which comprises: forming a length of tubing longitudinally into a preselected configuration so that the free ends thereof are arranged to connect with said refrigeration system, including at least one portion intermediate said ends being in a single plane; placing said portion of said tubing intermediate said free ends in a forming means; connecting at least one of said free ends to a source of constant pressure through a control means having means for measuring said pressure passing through said tubing; squeezing said portion of the tubing in the forming means at a first speed until the tubing reaches an intermediate predetermined restriction; then squeezing said portion of tubing at a second slower speed until the tubing restriction causes the medium passing through said tubing to reach a final predetermined pressure; and terminating said second squeezing operation when said measuring means indicates said predetermined pressure.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said intermediate predetermined restriction is between 90 and 99% of final predetermined restriction.
References Cited (Backward Citations)
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Cited
US2791239A
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US2950608A
Cited
US3311131A
Cited
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US3866448A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-06 | 1980-01-05 | 1980-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-06 | 1984-01-05 | 1984-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-06 | 1988-01-05 | 1988-07-06 | $7700.00 | Window Closed / Lapsed |