Patent US302309A successfully refreshed from Google Patents.
Patent US3917285A successfully refreshed from Google Patents.
US3917285A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Collar for joint of underground pipe
Assignee: Madison Management Group Inc
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Filing: 1973-11-09
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Granted: 1975-11-04
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Expires: 1993-11-09
Abstract
Abstract A method for joining nonmetallic pipes underground, with the pipes having mating pairs of bells and spigots, by fitting between mating spigots and bells dry distortable bands of an open celled material (preferably reticulated polyurethane foam) having a particulate water reactive material (preferably portland cement) impregnated therein and engaging each of the bands between one of the bells and its mating spigot. On wetting of the bands with water, the water reactive material therefor forms a water impervious hard sealant.
Inventors
- 👤 Harold V Swanson
- 👤 Robert E Bald
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:23
CPC Classifications
F; F16; F16L; F16L21/00; F16L21/02; F16L21/025; F16L13/00; F16L13/10; F16L13/11; F16L13/113; F16L21/05; F16L58/00; F16L58/18; F16L58/185; Y; Y10; Y10S; Y10S277/00; Y10S277/935; Y10S277/944; Y10S285/00; Y10S285/915
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
92 words
A method for sealing a joint of a pipe made of a non-metallic earthen material and having a bell and a spigot, the method comprising steps as follows: impregnating a distortable band of a cellular water invadable material with a dry hydratable cement which is reactive with water to hydrate thereby forming a water insoluble hard sealant, 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
92 words
A method for sealing a joint of a pipe made of a non-metallic earthen material and having a bell and a spigot, the method comprising steps as follows: impregnating a distortable band of a cellular water invadable material with a dry hydratable cement which is reactive with water to hydrate thereby forming a water insoluble hard sealant, 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
18 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
18 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.
References Cited (Backward Citations)
US1662603A
Cited
US2051557A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-03 | 1979-05-05 | 1979-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-03 | 1983-05-05 | 1983-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-03 | 1987-05-05 | 1987-11-04 | $7700.00 | Window Closed / Lapsed |