US2783174A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing fibrous tubes
Assignee: 3M Co
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Filing: 1953-05-20
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Granted: 1957-02-26
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Expires: 1973-05-20
Abstract
No abstract record available.
Inventors
- 👤 Joseph F Stephens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:17
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/80; B29C53/8008; B29C53/8066; B29C53/56; B29C53/58; B29C53/60; B29C53/62; B29C53/64; B29C70/00; B29C70/04; B29C70/28; B29C70/30; B29C70/32; B29C70/323; B29C70/326; Y; Y10; Y10S; Y10S264/00; Y10S264/53
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
IN THE PROCESS OF FORMING COMPOSITE FIBROUS TUBES WHEREIN A BINDING AGENT IS APPLIED TO A FIBROUS MATERIAL AND THE FIBROUS MATERIAL IS WOUND TIGHTLY ABOUT A CYLINDRICAL MANDREL IN SUPERIMPOSED LAYERS TO FORM A TUBE IN PLACE ON THE MANDREL, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF ROTATING THE MANDREL AND TUBE ABOUT THEIR COMMON, AXIS AT A SPEED SUFFICIENT TO CAUSE THE INNER SURFACE OF THE TUBE TO SEPARATE BY CENTRIFUGAL ACTION FROM THE SURFACE OF THE MANDREL TO PRODUCE AN ANNULAR CAVITY BETWEEN SAID SURFACES, ROTATABLY SUPPORTING AT THE SAME SPEED THE EXTERIOR SURFACE OF THE TUBE FOLLOWING SEPARATION OF THE INNER SURFACE OF THE TUBE FROM THE SURFACE OF SAID MANDREL TO MAINTAIN THE TUBE WALL IN SUBSTANTIALLY CIRCULAR FORM BUT SEPARATED FROM SAID MANDREL, AND WHILE MAINTAINING SAID TUBE IN SEPARATED RELATION WITH SAID MANDREL CURING THE BINDING AGENT TO SET TUBE IN ITS FINAL FORM.
Claim 2
Dependent Claim
151 words
IN THE PROCESS OF FORMING COMPOSITE FIBROUS TUBES WHEREIN A BINDING AGENT IS APPLIED TO A FIBROUS MATERIAL AND THE FIBROUS MATERIAL IS WOUND TIGHTLY ABOUT A CYLINDRICAL MANDREL IN SUPERIMPOSED LAYERS TO FORM A TUBE IN PLACE ON THE MANDREL, THE IMPROVEMENT WHICH COMPRISES THE STEPS OF ROTATING THE MANDREL AND TUBE ABOUT THEIR COMMON, AXIS AT A SPEED SUFFICIENT TO CAUSE THE INNER SURFACE OF THE TUBE TO SEPARATE BY CENTRIFUGAL ACTION FROM THE SURFACE OF THE MANDREL TO PRODUCE AN ANNULAR CAVITY BETWEEN SAID SURFACES, ROTATABLY SUPPORTING AT THE SAME SPEED THE EXTERIOR SURFACE OF THE TUBE FOLLOWING SEPARATION OF THE INNER SURFACE OF THE TUBE FROM THE SURFACE OF SAID MANDREL TO MAINTAIN THE TUBE WALL IN SUBSTANTIALLY CIRCULAR FORM BUT SEPARATED FROM SAID MANDREL, AND WHILE MAINTAINING SAID TUBE IN SEPARATED RELATION WITH SAID MANDREL CURING THE BINDING AGENT TO SET TUBE IN ITS FINAL FORM.
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) | 1960-02-26 | 1960-08-27 | 1961-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-26 | 1964-08-27 | 1965-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-26 | 1968-08-27 | 1969-02-26 | $7700.00 | Window Closed / Lapsed |