US3985848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cutting concrete coated pipe
Assignee: Bredero Price BV
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Filing: 1974-12-05
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Granted: 1976-10-12
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Expires: 1994-12-05
Abstract
Abstract A method for cutting an arcuate groove in an uncured concrete coating on an arcuate surface. A jet stream of water is directed at the coating along a line extending tangentially of the surface in a downward direction. The object is rotated at a relatively low speed in relation to the stationary water jet. The invention also encompasses a method of applying a concrete coating to pipe wherein after the cement is forced onto the pipe a wrapping material is wound around the pipe in a spiral pattern to hold on the concrete. The wrapping material may be a water impervious plastic which will affect curing of the cement without the aid of chemical curing agents.
Inventors
- 👤 Onno F. Frische
- 👤 Hans De Kok
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:05
CPC Classifications
F; F16; F16L; F16L9/00; F16L9/14; F16L9/153; B; B28; B28B; B28B17/00; B28B17/0036; B28B19/00; B28B19/0038; Y; Y10; Y10T; Y10T83/00; Y10T83/061; Y10T83/364
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
108 words
A method of cutting a circumferential groove through an uncured concrete coating on a generally cylindrical pipe, having a curved outer surface on which said coating is applied, said method comprising: supporting said pipe with the axis of curvature of said curved outer surface extending substantially horizontally; projecting a jet stream of water in a downward direction transverse to said axis and tangent to said curved surface of said pipe at a point at least 45 circumferential degrees below the plane of said axis; and effecting relative rotation between said coated pipe and said jet stream, about said axis at a rate of from 5 to 10 r.p.m.
Claim 2
Independent Claim
108 words
A method of cutting a circumferential groove through an uncured concrete coating on a generally cylindrical pipe, having a curved outer surface on which said coating is applied, said method comprising: supporting said pipe with the axis of curvature of said curved outer surface extending substantially horizontally; projecting a jet stream of water in a downward direction transverse to said axis and tangent to said curved surface of said pipe at a point at least 45 circumferential degrees below the plane of said axis; and effecting relative rotation between said coated pipe and said jet stream, about said axis at a rate of from 5 to 10 r.p.m.
Claim 3
Independent Claim
109 words
A method of cutting a circumferential groove through an uncured concrete coating on a generally cylindrical pipe, having a curved outer surface on which said coating is applied, said method comprising: supporting said pipe with the axis of curvature of said curved outer surface extending substantially horizontally; projecting a jet stream of water, at a pressure from 20 to 60 kg/cm 2 , in a downward direction transverse to said axis and tangent to said curved surface of said pipe at a point at least 45 circumferential degrees below the plane of said axis; and effecting relative rotation between said coated pipe and said jet stream, about said axis.
Claim 4
Independent Claim
109 words
A method of cutting a circumferential groove through an uncured concrete coating on a generally cylindrical pipe, having a curved outer surface on which said coating is applied, said method comprising: supporting said pipe with the axis of curvature of said curved outer surface extending substantially horizontally; projecting a jet stream of water, at a pressure from 20 to 60 kg/cm 2 , in a downward direction transverse to said axis and tangent to said curved surface of said pipe at a point at least 45 circumferential degrees below the plane of said axis; and effecting relative rotation between said coated pipe and said jet stream, about said axis.
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) | 1979-10-12 | 1980-04-12 | 1980-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-12 | 1984-04-12 | 1984-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-12 | 1988-04-12 | 1988-10-12 | $7700.00 | Window Closed / Lapsed |