US3349568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for foraming in place underground conduit
Assignee: Dow Chemical Co
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Filing: 1964-10-08
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Granted: 1967-10-31
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Expires: 1984-10-08
Abstract
No abstract record available.
Inventors
- 👤 Hubert S Smith
- 👤 Ulmanis Eugene
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:07
CPC Classifications
F; F16; F16L; F16L1/00; F16L1/024; F16L1/028; F16L1/038; E; E02; E02F; E02F5/00; E02F5/02; E02F5/10; E02F5/101; F16L1/06; F16L1/065; F16L59/00; F16L59/14; F16L59/15; F16L9/00; F16L9/12; F16L9/127; Y; Y10; Y10S; Y10S521/00; Y10S521/917
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
148 words
APPARATUS FOR LAYING PLASTIC PIPE UNDERGROUND COMPRISING, IN COMBINATION: A POWER DRIVEN VEHICLE WITH A PLOW ASSEMBLAGE THEREON FOR FORMING A PASSAGEWAY UNDERGROUND AT A DESIRED DISTANCE FROM THE GROUND SURFACE AND HAVING A SUBSTANTIALLY CIRCULAR CROSS-SECTION, SAID PLOW ASSEMBLAGE HAVING AT ALOWER EXTREMITY A POINTED FORWARD END AND A HORIZONTALLY EXTENDING TUBULAR END PORTION; CHEMICAL REACTANT FEED MEANS ON SAID VEHICLE, ACTIVATOR MEANS INCLUDED IN SAID LOWER EXTREMITY IN COMMUNICATION WITH SAID FEED MEANS FOR ACTIVATING A CHEMICAL REACTANT TO FORM A PLASTIC MATERIAL WHICH FOAMS; EMITTING MEANS COMMUNICATING WITH SAID ACTIVATOR MEANS, DISTRIBUTOR MEANS OUTWARDLY OF SAID TUBULAR END PORTION AND TRANSVERSE THEREOF TO UNIFORMLY DISTRIBUTE SAID PLASTIC MATERIAL LATERALLY OUTWARDLY AGAINST THE WALLS OF SAID CIRCULAR PASSAGEWAY WHICH IS FORMED AS SAID PLOW ASSEMBLAGE IS DRIVEN THROUGH THE GROUND, AND MEANS FOR CONVEYING SAID FOAMED PLASTIC MATERIAL FROM SAID ACTIVATOR MEANS TO SAID DISTRIBUTOR MEANS.
Claim 2
Dependent Claim
148 words
APPARATUS FOR LAYING PLASTIC PIPE UNDERGROUND COMPRISING, IN COMBINATION: A POWER DRIVEN VEHICLE WITH A PLOW ASSEMBLAGE THEREON FOR FORMING A PASSAGEWAY UNDERGROUND AT A DESIRED DISTANCE FROM THE GROUND SURFACE AND HAVING A SUBSTANTIALLY CIRCULAR CROSS-SECTION, SAID PLOW ASSEMBLAGE HAVING AT ALOWER EXTREMITY A POINTED FORWARD END AND A HORIZONTALLY EXTENDING TUBULAR END PORTION; CHEMICAL REACTANT FEED MEANS ON SAID VEHICLE, ACTIVATOR MEANS INCLUDED IN SAID LOWER EXTREMITY IN COMMUNICATION WITH SAID FEED MEANS FOR ACTIVATING A CHEMICAL REACTANT TO FORM A PLASTIC MATERIAL WHICH FOAMS; EMITTING MEANS COMMUNICATING WITH SAID ACTIVATOR MEANS, DISTRIBUTOR MEANS OUTWARDLY OF SAID TUBULAR END PORTION AND TRANSVERSE THEREOF TO UNIFORMLY DISTRIBUTE SAID PLASTIC MATERIAL LATERALLY OUTWARDLY AGAINST THE WALLS OF SAID CIRCULAR PASSAGEWAY WHICH IS FORMED AS SAID PLOW ASSEMBLAGE IS DRIVEN THROUGH THE GROUND, AND MEANS FOR CONVEYING SAID FOAMED PLASTIC MATERIAL FROM SAID ACTIVATOR MEANS TO SAID DISTRIBUTOR MEANS.
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) | 1970-10-30 | 1971-05-01 | 1971-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-30 | 1975-05-01 | 1975-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-30 | 1979-05-01 | 1979-10-31 | $7700.00 | Window Closed / Lapsed |