US3551999A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Butt-joining of steel bars
Assignee: Individual
•
Filing: 1967-12-13
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Granted: 1971-01-05
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Expires: 1987-12-13
Abstract
Abstract A TUBULAR SLEEVE IS PLACED OVER A PAIR OF ALIGNED ENDBUTTED STEEL BARS. THE STEEL BARS ARE COMPRESSED BY TOTALLY SURROUNDING JAWS TO COLD-FLOW THE TUBULAR SLEEVE AROUND THE STEEL BARS OVER THE ENTIRE SURROUNDED SURFACES THEREOF, PREFERABLY, THE TUBULAR SLEEVE HAS INTERNAL, INCLINED SERRATIONS SO THAT, UPON COMPRESSION, AXIAL FORCES ARISE TENDING TO PRESS THE STEEL BARS TOWARDS EACH OTHER, STEEL WIRES MAY BE INSERTED PRIOR TO THE COMPRESSION STEP TO FURTHER INCREASE THE TENSILE STRENGTH OF THE JOINT.
Inventors
- 👤 Siegfried Gutmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:15
CPC Classifications
F; F16; F16B; F16B17/00; F16B17/004; B; B21; B21D; B21D39/00; B21D39/04; B21F; B21F15/00; B21F15/02; B21F15/06; E; E04; E04C; E04C5/00; E04C5/16; E04C5/162; E04C5/163; E04C5/165; E06; E06B; E06B7/00; E06B7/16; E06B7/22; E06B7/232; F16B4/00; F16B7/00; F16B7/04; F16B7/0406; F16B7/0426; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49908; Y10T29/49925; Y10T29/49927; Y10T29/49929; Y10T403/00; Y10T403/49; Y10T403/57
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |