Patent US3581456A successfully refreshed from Google Patents.
US3581456A
Expired / Lapsed
US
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Applying a threaded closure by magnetic impulse
Assignee: Primerica Inc
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Filing: 1968-11-18
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Granted: 1971-06-01
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Expires: 1988-11-18
Abstract
Abstract A method for forming a closure on the neck finish of a filled container which utilizes the force generated by a transient magnetic field. The skirt of a cap, positioned on the neck of the container, is urged by the field against the neck finish so as to cause the skirt to conform to the contours of the neck finish and to thereby hold the cap in engagement with the neck finish upon the neck of the container.
Inventors
- 👤 Robert Andrew Gere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:31
CPC Classifications
B; B67; B67B; B67B3/00; B67B3/02; B67B3/10; B21; B21D; B21D26/00; B21D26/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A method for forming a twist-off closure for the threaded neck of a container, comprising the steps of: placing, over the neck finish of the container, a cap having a ductile and electrically conductive skirt, which skirt is adapted to conform to the contours of the neck finish of the container when pressed against the neck; and applying a transient magnetic field to the skirt to press the skirt against the contours of the neck finish with sufficient force to conform the skirt to the neck finish, a contour of roots and threads being impressed in the inner surface of the skirt which includes threads conforming closely to the roots of the neck finish.
Claim 2
Independent Claim
114 words
A method for forming a twist-off closure for the threaded neck of a container, comprising the steps of: placing, over the neck finish of the container, a cap having a ductile and electrically conductive skirt, which skirt is adapted to conform to the contours of the neck finish of the container when pressed against the neck; and applying a transient magnetic field to the skirt to press the skirt against the contours of the neck finish with sufficient force to conform the skirt to the neck finish, a contour of roots and threads being impressed in the inner surface of the skirt which includes threads conforming closely to the roots of the neck finish.
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) | 1974-05-31 | 1974-11-30 | 1975-06-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-31 | 1978-11-30 | 1979-06-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-31 | 1982-11-30 | 1983-06-01 | $7700.00 | Window Closed / Lapsed |