US4049295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Couplings for metal tubes
Assignee: Individual
•
Filing: 1976-04-13
•
Granted: 1977-09-20
•
Expires: 1996-04-13
Abstract
Abstract A fluid-tight coupling for the end to end connection of metal tubes consists essentially of a conical male element and a conical female element fixed to the end of a respective tube, at least one of said elements being constituted by a permanent magnet.
Inventors
- 👤 Eugene Piers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:36
CPC Classifications
F; F16; F16L; F16L37/00; F16L37/004
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A fluid-tight saftey coupling for metal tubes comprising a male conical metal element fixed to a first tube and a female conical metal element fixed to a second tube, said male and female metal elements having surfaces constituting cones of identical pitch, both of said elements being permanent magnets, the female element being formed with a cylindrical recess coaxial with the said female element and located at the narrow end of said female element to receive the end of said first tube therein, in overlapping relation to the end of said second tube.
Claim 2
Dependent Claim
93 words
A fluid-tight saftey coupling for metal tubes comprising a male conical metal element fixed to a first tube and a female conical metal element fixed to a second tube, said male and female metal elements having surfaces constituting cones of identical pitch, both of said elements being permanent magnets, the female element being formed with a cylindrical recess coaxial with the said female element and located at the narrow end of said female element to receive the end of said first tube therein, in overlapping relation to the end of said second tube.
References Cited (Backward Citations)
DE492612C
Cited
US2453669A
Cited
US2922663A
Cited
FR1236595A
Cited
US3181895A
Cited
US3151695A
Cited
US3269608A
Cited
DE2019293A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-09-19 | 1981-03-21 | 1981-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-19 | 1985-03-21 | 1985-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-19 | 1989-03-21 | 1989-09-20 | $7700.00 | Window Closed / Lapsed |