US3909010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion protective collar for underground pipe joints with metal parts
Assignee: Madison Management Group Inc
•
Filing: 1973-05-14
•
Granted: 1975-09-30
•
Expires: 1993-05-14
Abstract
Abstract A method of protecting pipes with bell and spigot joints (having metal parts) from corrosion by fitting between the spigot and bell at least one dry band of open celled material (preferably reticulated polyurethane foam) having a particulate alkaline material (preferably Portland cement) impregnated therein and engaging the band between the bell and the spigot. On wetting of the band, the alkaline material is hydrated to protect the metal.
Inventors
- 👤 Harold V Swanson
- 👤 Robert E Bald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:41
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/02; F16L21/025; F16L21/05; F16L58/00; F16L58/18; F16L58/185; Y; Y10; Y10S; Y10S277/00; Y10S277/919; Y10S277/935; Y10S277/944
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
88 words
A METHOD FOR PROTECTING FOR CORROSION A PIPE WITH FERRICMETALIC COMPONENTS AND HAVING A BELL AND A SPIGET, THE METHOD COMPRISING STEPS AS FOLLOWS, IMPREGNATING A DISTORTABLE BAND A CELLULAR WATER INVADABLE MATERIAL WITH A DRY HYDRATABLE CEMENT WHICH IS REACTIVE WITH WATER TO HYDRATE THEREBY FORMING AN ALKALI RELEASING WATER IMPERRVIOUS SUBSTANCE, PLACING THE BAND BETWEEN THE SPIGOT AND THE BELL, ENGAGING THE BAND IN THE JOINT BY INSERTING THE SPIGOT INTO THE BELL ALLOWING THE BAND TO BE CONTACTED WITH WATER WHEREBY THE HYDRATION TAKES PLACE.
Claim 2
Independent Claim
88 words
A METHOD FOR PROTECTING FOR CORROSION A PIPE WITH FERRICMETALIC COMPONENTS AND HAVING A BELL AND A SPIGET, THE METHOD COMPRISING STEPS AS FOLLOWS, IMPREGNATING A DISTORTABLE BAND A CELLULAR WATER INVADABLE MATERIAL WITH A DRY HYDRATABLE CEMENT WHICH IS REACTIVE WITH WATER TO HYDRATE THEREBY FORMING AN ALKALI RELEASING WATER IMPERRVIOUS SUBSTANCE, PLACING THE BAND BETWEEN THE SPIGOT AND THE BELL, ENGAGING THE BAND IN THE JOINT BY INSERTING THE SPIGOT INTO THE BELL ALLOWING THE BAND TO BE CONTACTED WITH WATER WHEREBY THE HYDRATION TAKES PLACE.
Claim 3
Dependent Claim
13 words
The method of claim 1 with the band arranged annularly around the spigot.
Claim 4
Dependent Claim
13 words
The method of claim 2 with the band being a reticulated polyurethane foam.
Claim 5
Dependent Claim
11 words
The method of claim 1 with the cement being Portland cement.
Claim 6
Dependent Claim
17 words
The method of claim 1 and providing a water-permeable sheath about the band to contain the cement.
Claim 7
Dependent Claim
11 words
The method of claim 5 with the cement being Portland cement.
Claim 8
Dependent Claim
13 words
The method of claim 5 with the sheath being a nonwoven polyester fabric.
Claim 9
Dependent Claim
13 words
The method of claim 1 with the band arranged annularly in the bell.
Claim 10
Dependent Claim
15 words
The method of claim 8 with the band being made of a reticulated polyurethane foam.
Claim 11
Dependent Claim
11 words
The method of claim 8 with the cement being Portland cement.
Claim 12
Dependent Claim
17 words
The method of claim 8 and providing a water-permeable sheath about the band to contain the cement.
Claim 13
Dependent Claim
11 words
The method of claim 11 with the cement being Portland cement.
Claim 14
Dependent Claim
13 words
The method of claim 11 with the sheath being a nonwoven polyester fabric.
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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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |