US3710579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Portable coffer dam and method of making
Assignee: Individual
•
Filing: 1971-05-13
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Granted: 1973-01-16
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Expires: 1991-05-13
Abstract
Abstract A portable coffer dam consisting of a plurality of rings, each ring consisting of a plurality of sections, each section comprising a pair of side plates spaced by trusses, end plates, attaching means, plastic foam filling between the plates, ballast and a compressed air flotation element in the plastic foam, with exhaust and recompressing means on the flotation element, together with sealing means between the sections and rings. The method consists of fabricating the ring sections, foaming them on land, floating them to the site and then assembling the sections into rings on the site, lowering the rings into stacked position by adjusting the flotation elements to form the coffer dam.
Inventors
- 👤 P Zvonek
- 👤 D Killmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 04:57
CPC Classifications
E; E02; E02D; E02D19/00; E02D19/02; E02D19/04; E02B; E02B3/00; E02B3/04; E02B3/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
71 words
A coffer dam consisting of a plurality of rings stacked one upon another, each ring comprising a plurality of sections, each section having an inside plate and an outside plate secured together in spaced relation, the space between said plates being filled with a rigid poly urethane plastic foam, means to secure said sections together to form a hollow ring and means to secure said rings together to form the dam.
Claim 2
Dependent Claim
71 words
A coffer dam consisting of a plurality of rings stacked one upon another, each ring comprising a plurality of sections, each section having an inside plate and an outside plate secured together in spaced relation, the space between said plates being filled with a rigid poly urethane plastic foam, means to secure said sections together to form a hollow ring and means to secure said rings together to form the dam.
Claim 3
Dependent Claim
41 words
The structure of claim 1, in which each said section, in addition to said foam, is provided with ballast, and a compressed air chamber having intake and exhaust passageways, there being a solenoid valve in at least one of said passageways.
Claim 4
Dependent Claim
32 words
The structure of claim 1, in which the plates of each said section are provided with flanges along each edge, whereby said sections and said rings may be connected to one another.
Claim 5
Dependent Claim
25 words
The structure of claim 3, in which the inside face of each section and each flange is sprayed with a flexible poly urethane plastic foam.
Claim 6
Dependent Claim
49 words
The structure of claim 1, in which the upper ring of said stack of rings is partly above water lever, there being a base plate beneath said stack and a head plate on the top of said stack, said head plate having a non-slip surface for permitting walking thereon.
Claim 7
Independent Claim
88 words
The method of constructing a coffer dam which consists of the steps of fabricating, on dry land, pairs of spaced, flanged, plates into sections, spraying the insides of said sections and said flanges with a flexible plastic material, providing each section with ballast and a compressed air chamber, filling said sections with rigid polyurethane plastic foam, floating said sections to the coffer dam site, assembling said sections into ring like members in the water and then stacking said ring like members in the water to form the dam.
Claim 8
Independent Claim
88 words
The method of constructing a coffer dam which consists of the steps of fabricating, on dry land, pairs of spaced, flanged, plates into sections, spraying the insides of said sections and said flanges with a flexible plastic material, providing each section with ballast and a compressed air chamber, filling said sections with rigid polyurethane plastic foam, floating said sections to the coffer dam site, assembling said sections into ring like members in the water and then stacking said ring like members in the water to form the dam.
Claim 9
Dependent Claim
43 words
The method of claim 6, in which the steps of assembling the the sections into rings and the stacking of the rings is accomplished by floatation, utilizing the inherent buoyancy of the plastic foam, and the compression and decompression of the air chambers.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |