US3256503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the manufacture of flexible tubes of resin-impregnated porous material
Assignee: Flexible Tubing Corp
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Filing: 1961-04-25
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Granted: 1966-06-14
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Expires: 1981-04-25
Abstract
No abstract record available.
Inventors
- 👤 Charles N Bristol
- 👤 Marcus A Hall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:26
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/56; B29C53/562; B29C53/80; B29C53/82; B29C53/821; B29C53/828; B29K; B29K2105/00; B29K2105/04; B29L; B29L2023/00; B29L2023/22; B29L2023/225; Y; Y10; Y10S; Y10S156/00; Y10S156/934; Y10T; Y10T156/00; Y10T156/19
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
116 words
APPARATUS FOR MAKING A FLEXIBLE TUBE FROM AN ELONGATED STRIP OF RESIN-IMPREGNATED POROUS MATERIAL COMPRISING AN ELONGATED MANDREL; FORMING MEANS FOR ROLLING SAID ELONGATED STRIP LONGITUDINALLY ABOUT SAID MANDREL IN A PLURALITY OF TURNS; AN OVEN FOR HEAT-CURING THE RESIN IN THE ROLLED-UP STRIP TO FORM A UNITARY TUBULAR ELEMENT ABOUT SAID MANDREL; AND MANDREL STRIPPING MEANS COMPRISING A PAIR OF OPPOSED ELONGATED RESILIENT FLUID-INFLATABLE GRIPPING MEMBERS, DISPLACEMENT MEANS FOR PLACING THE MANDREL AND TUBULAR ELEMENT BETWEEN SAID GRIPPING MEMBERS, MEANS FOR INFLATING SAID GRIPPING MEMBERS TO HOLD SAID TUBULAR ELEMENT SUBSTANTIALLY THROUGHOUT ITS LENGTH, AND MEANS FOR MOVING THE INFLATED GRIPPING MEMBERS AND THE TUBULAR ELEMENT HELD THEREBETWEEN LONGITUDINALLY OFF THE END OF SAID MANDREL.
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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) | 1969-06-13 | 1969-12-13 | 1970-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-13 | 1973-12-13 | 1974-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-13 | 1977-12-13 | 1978-06-14 | $7700.00 | Window Closed / Lapsed |