US3736400A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for damming pipe ends for welding
Assignee: Gilbreth Co
•
Filing: 1971-08-31
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Granted: 1973-05-29
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Expires: 1991-08-31
Abstract
Abstract A method and apparatus for welding together a pair of pipe ends. The method comprises providing a water soluble dam at each pipe end, inserting an inert gas into the ends between the dams, welding the ends together and passing a fluid containing water through the pipe to dissolve the dam.
Inventors
- 👤 J Spiegel
- 👤 A Miller
- 👤 I Klukoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 18:32
CPC Classifications
B; B23; B23K; B23K9/00; B23K9/32; B23K9/325; B23K9/326; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49428
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
95 words
Apparatus for enabling the welding of a pair of tubular pipe ends having interior peripheral surfaces, by establishing a space within said pipe ends and contiguous therewith into which an inert gas is provided, said apparatus comprising a dam in each of said pipe ends, each of said dams including a peripheral edge in contact with the interior surface of the associated pipe end and being formed of a water soluble paper to enable the removal of said dams by passing a fluid containing water through said pipe ends after said ends have been welded.
Claim 2
Dependent Claim
95 words
Apparatus for enabling the welding of a pair of tubular pipe ends having interior peripheral surfaces, by establishing a space within said pipe ends and contiguous therewith into which an inert gas is provided, said apparatus comprising a dam in each of said pipe ends, each of said dams including a peripheral edge in contact with the interior surface of the associated pipe end and being formed of a water soluble paper to enable the removal of said dams by passing a fluid containing water through said pipe ends after said ends have been welded.
Claim 3
Dependent Claim
32 words
The apparatus of claim 1 wherein said dams are each conically shaped having accordian pleated side walls to enable said dam to be utilized in a large plurality of sizes of pipes.
Claim 4
Dependent Claim
35 words
The apparatus of claim 1 wherein each dam is formed of a circular blank having a plurality of radially extending slits, said dam having a circular planar central portion and a peripheral transversely extending skirt.
Claim 5
Dependent Claim
46 words
The apparatus of claim 1 wherein said dam is formed of a blank which is circular yet which includes a sector opening and a radially extending fold line forming a sector tab, said tab adhesively securing the edges of said blank to form a conical dam.
Claim 6
Dependent Claim
45 words
The apparatus of claim 1 wherein each dam is formed of a circular blank having a radially extending slit, said blank having a pair of ends which are overlapped to form a conically shaped dam which is adjustable to conform to various diameters of pipe.
Claim 7
Dependent Claim
41 words
The apparatus of claim 1 wherein each dam is formed of a closed bag having water soluble paper walls, said bag being conformable to a variety of shapes so that it can be stuffed into a pipe end of irregular shape.
References Cited (Backward Citations)
US1126710A
Cited
US2320700A
Cited
US2654014A
Cited
US2802092A
Cited
US2882385A
Cited
US3347297A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-28 | 1976-11-27 | 1977-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-28 | 1980-11-27 | 1981-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-28 | 1984-11-27 | 1985-05-29 | $7700.00 | Window Closed / Lapsed |