US3733382A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of centrifugally applying foam insulation to a pipe
Assignee: Shell USA Inc
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Filing: 1969-04-10
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Granted: 1973-05-15
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Expires: 1989-04-10
Abstract
Abstract A METHOD 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 ROUND 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. D R A W I N G
Inventors
- 👤 Dijk J Van
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:14
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: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-14 | 1976-11-13 | 1977-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-14 | 1980-11-13 | 1981-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-14 | 1984-11-13 | 1985-05-15 | $7700.00 | Window Closed / Lapsed |