Patent US3900912A successfully refreshed from Google Patents.
US3900912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pipeline paraffin scraper
Assignee: Wintershall Dea International AG
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Filing: 1973-07-13
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Granted: 1975-08-26
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Expires: 1993-07-13
Abstract
Abstract A paraffin scraper for pipelines. It is the type commonly called a pig, which is driven through the pipeline by fluid pressure in the pipeline. It has a solid plastic cylindrical shape with a number of annular recesses. In addition, there is a smalldiameter axial bore extending through the whole length of the body to create a jet-fluid stream at the front during scraping action.
Inventors
- 👤 Manfred Lenz
- 👤 Paul Reynohs
- 👤 Willi Westen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:11
CPC Classifications
B; B08; B08B; B08B9/00; B08B9/02; B08B9/027; B08B9/04; B08B9/053; B08B9/055; B08B9/0553; F; F16; F16L; F16L2101/00; F16L2101/10; F16L2101/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
164 words
A pipeline paraffin scraper, comprising in combination a solid generally cylindrical body of plastic material, said body having a pair of arcuate annular recesses spaced axially apart and from the ends of said body leaving maximum diameter smooth surface areas therebetween, a frusto conical front end on said body having a pair of parallel walled recesses therein, said parallel walls being parallel to and symmetrically located relative to the axis of said body, said parallel walled recesses extending diametrically to the outside surface of said front end and forming transverse flat walls near the base of said frusto conical front end, an axially located small-diameter passage extending through said body including said front end for permitting a jet of pipeline fluid to precede the scraper as it moves through the pipeline, and a transverse small-diameter passage interconnecting said parallel walled recesses and communicating with said axial passage and having the openings thereof at said parallel walls located near said base of said front end.
Claim 2
Dependent Claim
164 words
A pipeline paraffin scraper, comprising in combination a solid generally cylindrical body of plastic material, said body having a pair of arcuate annular recesses spaced axially apart and from the ends of said body leaving maximum diameter smooth surface areas therebetween, a frusto conical front end on said body having a pair of parallel walled recesses therein, said parallel walls being parallel to and symmetrically located relative to the axis of said body, said parallel walled recesses extending diametrically to the outside surface of said front end and forming transverse flat walls near the base of said frusto conical front end, an axially located small-diameter passage extending through said body including said front end for permitting a jet of pipeline fluid to precede the scraper as it moves through the pipeline, and a transverse small-diameter passage interconnecting said parallel walled recesses and communicating with said axial passage and having the openings thereof at said parallel walls located near said base of said front end.
Claim 3
Dependent Claim
126 words
Pipeline paraffin scraper, comprising in combination, a solid generally cylindrical body of plastic material, a plurality of annular recesses between the ends of said body to provide scraping edges thereon, a frusto conical end on said body for acting as the front in a scraping operation, an axially located small-diameter passage through said body including said frusto conical end for permitting a jet of pipeline fluid to precede the scraper as it moves through the pipeline, a pair of recesses in said frusto conical end disposed parallel to each other on both sides of and spaced from the axial center of said scraper, and a transverse bore communicating with said parallel recesses and with said axial passage for avoiding accumulation of scraped paraffin in said recesses.
Claim 4
Dependent Claim
126 words
Pipeline paraffin scraper, comprising in combination, a solid generally cylindrical body of plastic material, a plurality of annular recesses between the ends of said body to provide scraping edges thereon, a frusto conical end on said body for acting as the front in a scraping operation, an axially located small-diameter passage through said body including said frusto conical end for permitting a jet of pipeline fluid to precede the scraper as it moves through the pipeline, a pair of recesses in said frusto conical end disposed parallel to each other on both sides of and spaced from the axial center of said scraper, and a transverse bore communicating with said parallel recesses and with said axial passage for avoiding accumulation of scraped paraffin in said recesses.
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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |