US3797981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for continuously producing tubular foamed polyurethane insulation
Assignee: Shell USA Inc
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Filing: 1972-10-25
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Granted: 1974-03-19
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Expires: 1992-10-25
Abstract
Abstract Apparatus for continuously producing tubular foamed polyurethane insulation in which a liquid foamable polyurethane composition is supplied to a rotary ring dispenser which centrifugally sprays the liquid onto a flexible sleeve positioned around and spaced from a pipe. The sleeve and dispensed liquid are moved axially relative to the dispenser and the outer surface of the sleeve is supported while the liquid foams and expands radially to fill the space between the pipe and the sleeve.
Inventors
- 👤 Dijk J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:05
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/461; B29C44/464; B29C44/20; B29C44/32; B29C44/322; B29C44/324
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
189 words
An apparatus for producing tubular foamed polyurethane insulation, said apparatus comprising: a frame; a rotary ring dispenser mounted on said frame for centrifugally dispensing a liquid foamable polyurethane composition, said dispenser having a central opening therein; centering means carried by said frame for mounting a pipe coaxially with the dispenser through the central opening thereof; rotating means attached to said frame and operatively connected to said dispenser for rotating said dispenser about its axis to centrifugally dispense a liquid foamable polyurethane composition; supply means for feeding a liquid foamable polyurethane composition to said dispenser; reel holding means rotatably mounted on said frame and adapted to carry a plurality of reels of sheet material in a regular spaced relationship with respect to the circumference of said dispenser; and tubular support means mounted on said frame coaxially with said dispenser for supporting the outer surface of said sheet material when drawn off the reels and through the tubular support means, said tubular support means and said reels of sheet material being arranged relative to said dispenser so that said liquid composition is dispensed onto the inner surface of said sheet material.
Claim 2
Independent Claim
189 words
An apparatus for producing tubular foamed polyurethane insulation, said apparatus comprising: a frame; a rotary ring dispenser mounted on said frame for centrifugally dispensing a liquid foamable polyurethane composition, said dispenser having a central opening therein; centering means carried by said frame for mounting a pipe coaxially with the dispenser through the central opening thereof; rotating means attached to said frame and operatively connected to said dispenser for rotating said dispenser about its axis to centrifugally dispense a liquid foamable polyurethane composition; supply means for feeding a liquid foamable polyurethane composition to said dispenser; reel holding means rotatably mounted on said frame and adapted to carry a plurality of reels of sheet material in a regular spaced relationship with respect to the circumference of said dispenser; and tubular support means mounted on said frame coaxially with said dispenser for supporting the outer surface of said sheet material when drawn off the reels and through the tubular support means, said tubular support means and said reels of sheet material being arranged relative to said dispenser so that said liquid composition is dispensed onto the inner surface of said sheet material.
Claim 3
Dependent Claim
40 words
An apparatus as defined in claim 1 wherein the tubular support means comprises: a conical section having its wide end disposed around said dispenser; and a cylindrical section connected to the narrow end of the conical section and coaxial therewith.
Claim 4
Dependent Claim
39 words
An apparatus as defined in claim 2 wherein said frame is adapted to travel over the pipe inserted through the opening of the dispenser and further includes pipe engaging drive means for moving said frame relative to said pipe.
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) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |