Patent US2560369A successfully refreshed from Google Patents.
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 14:47
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.
References Cited (Backward Citations)
US713559A
Cited
US1015120A
Cited
US1023527A
Cited
US1576767A
Cited
US2045540A
Cited
US2052151A
Cited
US2128635A
Cited
US2176762A
Cited
US2321064A
Cited
US2343747A
Cited
US2330651A
Cited
US2430081A
Cited
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 |