US3766587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Scraper cups
Assignee: Trans Canada Pipelines Ltd
•
Filing: 1972-03-02
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Granted: 1973-10-23
•
Expires: 1992-03-02
Abstract
Abstract This invention provides a scraper cup for use with a pipeline pig, the scraper cup being generally dished or cotyloid in shape, and having generally a thicker wall to one side of its geometric centre than to the other side of its geometric centre. Thus, the centre of gravity of the scraper cup is displaced from its geometric centre, and the effect of this on the pipeline pig is to impart to the latter a tendency to seek a given horizontal orientation, in which the centre of gravity of the scraper cup is positioned directly below its geometric centre.
Inventors
- 👤 H French
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:34
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/04; B08B9/053; B08B9/055; B08B9/0557; G; G01; G01M; G01M3/00; G01M3/005; Y; Y10; Y10T; Y10T137/00; Y10T137/4891
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
62 words
A scraper cup of resilient material for use with a pipeline pig, the scraper cup being generally cotyloid with a substantially circular edge, the scraper cup having a greater wall thickness adjacent one portion of the circular edge than adjacent the antipodal portion of the circular edge, whereby the centre of gravity of the scraper cup is displaced from its geometric centre.
Claim 2
Dependent Claim
62 words
A scraper cup of resilient material for use with a pipeline pig, the scraper cup being generally cotyloid with a substantially circular edge, the scraper cup having a greater wall thickness adjacent one portion of the circular edge than adjacent the antipodal portion of the circular edge, whereby the centre of gravity of the scraper cup is displaced from its geometric centre.
Claim 3
Dependent Claim
51 words
A scraper cup as claimed in claim 1, in which the scraper cup is a hollow spherical segment, the wall thickness being greatest along a meridian intersecting said one portion of the circular edge, and diminishing gradually around both sides to the antipodal meridian, where the wall thickness is the least.
Claim 4
Dependent Claim
28 words
A scraper cup as claimed in claim 2, in which there is provided a central axial aperture for the attachment of the scraper cup to the pipeline pig.
Claim 5
Dependent Claim
70 words
A pipeline pig, comprising: an elongated central body, and at least two similar scraper cups, each scraper cup being generally cotyloid in shape and having a greater wall thickness in one area than in others, whereby the centre of gravity of each scraper cup is displaced from its geometric centre, both scraper cups being attached to the central body at their geometric centres and both opening in the same direction.
Claim 6
Dependent Claim
70 words
A pipeline pig, comprising: an elongated central body, and at least two similar scraper cups, each scraper cup being generally cotyloid in shape and having a greater wall thickness in one area than in others, whereby the centre of gravity of each scraper cup is displaced from its geometric centre, both scraper cups being attached to the central body at their geometric centres and both opening in the same direction.
Claim 7
Dependent Claim
50 words
A pipeline pig as claimed in claim 4, in which each scraper cup is a hollow spherical segment, the wall thickness of each being greatest along a meridian passing through said one area and diminishing gradually around both sides to the antipodal meridian, where the wall thickness is the least.
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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |