US3620258A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Insulation
Assignee: Newalls Insulation and Chemical Co Ltd
•
Filing: 1970-04-15
•
Granted: 1971-11-16
•
Expires: 1990-04-15
Abstract
Abstract Curved pipes are thermally insulated by wedge-shaped annular elements of resin-bonded glass or other mineral fiber in which the fibers are perpendicular to the axes of the elements, so that these are axially compressible. The elements are pressed together into face-to-face contact along the pipe. They may be made by stamping cylinders out of fiberboards and cutting each cylinder along a plane inclined to the axis.
Inventors
- 👤 Robert Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:26
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/14; F16L59/16; F16L59/22; F16L59/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
68 words
A curved pipe surrounded by a plurality of axially split annular elements of inorganic, fibrous, thermally insulating material, some at least of which are wedge-shaped in side view, the fibers in said elements essentially lying in planes perpendicular to the cylindrical axis of the annulus, whereby said elements are resiliently compressible in the axial direction, and said elements being pressed together into complete face-to-face contact around the pipe.
Claim 2
Dependent Claim
68 words
A curved pipe surrounded by a plurality of axially split annular elements of inorganic, fibrous, thermally insulating material, some at least of which are wedge-shaped in side view, the fibers in said elements essentially lying in planes perpendicular to the cylindrical axis of the annulus, whereby said elements are resiliently compressible in the axial direction, and said elements being pressed together into complete face-to-face contact around the pipe.
Claim 3
Dependent Claim
16 words
A curved pipe according to claim 1 in which the elements are of resin-bonded glass fiber.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |