Patent US3347725A successfully refreshed from Google Patents.
US3347725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making tubular thermal insulation
Assignee: Certainteed LLC
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Filing: 1963-02-27
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Granted: 1967-10-17
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Expires: 1983-02-27
Abstract
No abstract record available.
Inventors
- 👤 Frederick N Stephens
- 👤 Stuart J Burhans
- 👤 Joseph T Warkoczewski
- 👤 Jack M Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:56
CPC Classifications
F; F16; F16L; F16L59/00; F16L59/02; F16L59/021; B; B29; B29C; B29C53/00; B29C53/56; B29C53/58; B29C53/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
IN A METHOD OF MANUFACTURING TUBULAR ARTICLES FROM A FLEXIBLE MAT OF FIBERS AND INTERMIXED UNCURED HEAT REACTIVE BINDER, THE STEPS OF RAPIDLY ROTATING A HIGHLY HEATED MANDREL ABOUT ITS LONGITUDINAL AXIS, ADVANCING SAID MAT LATERALLY TOWARD AND INTO CONTACT WITH SAID MANDREL, ADHERING A PORTION OF THE MAT TO SAID MANDREL BY THE BINDER IN SAID MAT WHEREUPON SAID MAT IS WRAPPED RAPIDLY AND TIGHTLY ABOUT THE MANDREL BY THE ROTATION OF THE MANDREL TO FORM A TUBULAR BUILD-UP, MAINTAINING SAID BUILD-UP ON THE MANDREL A PERIOD OF TIME SUFFICIENT TO FORM A CURED
Claim 2
Dependent Claim
95 words
IN A METHOD OF MANUFACTURING TUBULAR ARTICLES FROM A FLEXIBLE MAT OF FIBERS AND INTERMIXED UNCURED HEAT REACTIVE BINDER, THE STEPS OF RAPIDLY ROTATING A HIGHLY HEATED MANDREL ABOUT ITS LONGITUDINAL AXIS, ADVANCING SAID MAT LATERALLY TOWARD AND INTO CONTACT WITH SAID MANDREL, ADHERING A PORTION OF THE MAT TO SAID MANDREL BY THE BINDER IN SAID MAT WHEREUPON SAID MAT IS WRAPPED RAPIDLY AND TIGHTLY ABOUT THE MANDREL BY THE ROTATION OF THE MANDREL TO FORM A TUBULAR BUILD-UP, MAINTAINING SAID BUILD-UP ON THE MANDREL A PERIOD OF TIME SUFFICIENT TO FORM A CURED
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) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |