US3687765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for thermally insulating pipe
Assignee: Shaw Pipe Industries Ltd
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Filing: 1970-05-11
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Granted: 1972-08-29
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Expires: 1990-05-11
Abstract
Abstract A THERMALLY INSULATING COATING IS FORMED ON A STEEL PIPE BY ROTATING THE PIPE SLOWLY ABOUT A HORIZONTAL AXIS WHCH SPRAYING A URETHANE FOAM MIX ONTO THE UPPER SURFACE OF THE PIPE, THE SPRAY TRAVERSING THE LENGHT OF THE PIPE TO BUILD UP A UNIFORM LAYER OF POLYURETHANE FOAM. THE PIPE SURFACE IS MAINTAINED AT THE REACTION TEMPERATURE. AN OUTER SHEATH OF POLYMERIC RESIN, SUCH AS HIGH DENSITY POLY- ETHYLENE, IS SUBSEQUIENTLY PROVIDED BY HELICALLY WINDING A RIBBON OF THE RESIN ONTO THE COATED PIPE. THE RIBBON IS EXTRUDED IN A HOT PLASTIC CONDITION AND APPLIED DIRECTLY TO THE COATED PIPE AFTER A MASTIC INSULATING LAYER HAS BEEN FORMED ON THE LATTER.
Inventors
- 👤 Peter M Maclean
- 👤 Leslie E Shaw
- 👤 Harold Jarvis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:21
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/02; F16L59/029; B; B29; B29C; B29C63/00; B29C63/02; B29C63/04; B29C63/08; B29C63/10; F16L59/04; F16L59/14; F16L59/143
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-08-29 | 1976-02-28 | 1976-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-29 | 1980-02-28 | 1980-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-29 | 1984-02-28 | 1984-08-29 | $7700.00 | Window Closed / Lapsed |