Patent US3293897A successfully refreshed from Google Patents.
US3293897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical bending apparatus for making coiled tubing
Assignee: Individual
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Filing: 1964-03-18
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Granted: 1966-12-27
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Expires: 1984-03-18
Abstract
No abstract record available.
Inventors
- 👤 Fred L Holter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:28
CPC Classifications
B; B21; B21D; B21D11/00; B21D11/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
A BENDING APPARATUS FOR COILING AN ELONGATED TUBELIKE MEMBER INTO A SPIRAL COIL PATTERN OF THE GENERAL HELICAL TYPE FOR USE AS A SPIRAL STAIR CASE RAIL AND THE LIKE COMPRISING A PAIR OF DIAMETRICALLY OPPOSED RADIALLY EXTENDING SPACERS, AXIALLY EXTENDING GUIDE CARRYING MEMBERS DISPOSED BETWEEN THE SPACERS AND EXTENDING RADIALLY OUTWARD FROM THE CENTRAL AXIS OF THE APPARATUS, AND MEANS COUPLING THE GUIDE CARRYING MEMBERS AND THE SPACERS IN ANGULAR POSITIONING OF ONE GUIDE CARRYING MEMBER RELATIVE TO THE OTHER, SAID GUIDE CARRYING MEMBERS EACH HAVING AN OUTER PORTION COLLECTIVELY PRESENTING WITH ANOTHER A GENERAL CIRCUMFERENTIAL ZONE ADAPTED TO DETERMINED THE GENERAL DIAMETRIC EXTENT OF THE SPIRAL COIL PATTERN, AND GUIDE MEANS DISPOSED ON THE OUTER PORTION OF EACH GUIDE CARRYING MEANS IN THE CIRCUMFERENTAIL ZONE AND ADAPTED FOR THE RECEPTION OF THE TUBE-LIKE MEMBER IN COILED CIRCUMSCRIBING AND AXIAL TRAVEL ABOVE THE APPARATUS FROM ONE GUIDE MEANS TO ANOTHER.
Claim 2
Dependent Claim
151 words
A BENDING APPARATUS FOR COILING AN ELONGATED TUBELIKE MEMBER INTO A SPIRAL COIL PATTERN OF THE GENERAL HELICAL TYPE FOR USE AS A SPIRAL STAIR CASE RAIL AND THE LIKE COMPRISING A PAIR OF DIAMETRICALLY OPPOSED RADIALLY EXTENDING SPACERS, AXIALLY EXTENDING GUIDE CARRYING MEMBERS DISPOSED BETWEEN THE SPACERS AND EXTENDING RADIALLY OUTWARD FROM THE CENTRAL AXIS OF THE APPARATUS, AND MEANS COUPLING THE GUIDE CARRYING MEMBERS AND THE SPACERS IN ANGULAR POSITIONING OF ONE GUIDE CARRYING MEMBER RELATIVE TO THE OTHER, SAID GUIDE CARRYING MEMBERS EACH HAVING AN OUTER PORTION COLLECTIVELY PRESENTING WITH ANOTHER A GENERAL CIRCUMFERENTIAL ZONE ADAPTED TO DETERMINED THE GENERAL DIAMETRIC EXTENT OF THE SPIRAL COIL PATTERN, AND GUIDE MEANS DISPOSED ON THE OUTER PORTION OF EACH GUIDE CARRYING MEANS IN THE CIRCUMFERENTAIL ZONE AND ADAPTED FOR THE RECEPTION OF THE TUBE-LIKE MEMBER IN COILED CIRCUMSCRIBING AND AXIAL TRAVEL ABOVE THE APPARATUS FROM ONE GUIDE MEANS TO ANOTHER.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |