US2560369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making flexible tubes
Assignee: Individual
•
Filing: 1946-03-18
•
Granted: 1951-07-10
•
Expires: 1966-03-18
Abstract
No abstract record available.
Inventors
- 👤 Roberts Robert Eldon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:37
CPC Classifications
B; B29; B29D; B29D23/00; B29D23/18; B29K; B29K2021/00; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE METHOD OF MAKING A REINFORCED FLEXIBLE TUBE COMPRISING PARTIALLY STRETCHING A HELICAL SPRING IN RADIAL SPACED RELATION ON A MANDREL, RADIALLY EXPANDING AN ELASTIC RUBBER TUBE, INSERTING THE MANDREL AND SPRING WITHIN THE EXPANDED RUBBER TUBE, ALLOWING THE EXPANDED TUBE TO CONTRACT AND ELASTICALLY EMBRACE THE SPRING, PRESSING THE OUTER RUBBER TUBE INWARDLY AGAINST THE MANDREL BETWEEN THE COILS OF THE SPRING, AND THEREAFTER PROVIDING A PROTECTIVE COVERING ON THE INNER SURFACE OF THE SPRING OF A DIFFERENT CHARACTER FROM THE OUTER TUBE.
Claim 2
Independent Claim
84 words
THE METHOD OF MAKING A REINFORCED FLEXIBLE TUBE COMPRISING PARTIALLY STRETCHING A HELICAL SPRING IN RADIAL SPACED RELATION ON A MANDREL, RADIALLY EXPANDING AN ELASTIC RUBBER TUBE, INSERTING THE MANDREL AND SPRING WITHIN THE EXPANDED RUBBER TUBE, ALLOWING THE EXPANDED TUBE TO CONTRACT AND ELASTICALLY EMBRACE THE SPRING, PRESSING THE OUTER RUBBER TUBE INWARDLY AGAINST THE MANDREL BETWEEN THE COILS OF THE SPRING, AND THEREAFTER PROVIDING A PROTECTIVE COVERING ON THE INNER SURFACE OF THE SPRING OF A DIFFERENT CHARACTER FROM THE OUTER TUBE.
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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) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |