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Patent US3664543A successfully refreshed from Google Patents.
US3664543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Easy-open tear strip reinforcing means
Assignee: Individual
•
Filing: 1970-10-08
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Granted: 1972-05-23
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Expires: 1990-10-08
Abstract
Abstract D R A W I N G A COINED INDENTATION AT THE BENDING LINE OF AN EASYOPEN CAN END TEAR STRIP. THE INDENTATION HAS NEARLY VERTICAL SIDE WALLS OF INCREASED THICKNESS AND THE METAL BETWEEN THE COINED AREA AND THE TEAR-STRIP SEVERING SCORE IS IN COMPRESSION. THIS PREVENTS THE FORMATION OF CRACKS IN THE SCORE AND INCREASES THE STRENGTH OF THE STRIP TO PREVENT ITS BREAKING WHEN A CREASE IS FORMED WHEN THE CAN IS OPENED IMPROPERLY.
Inventors
- 👤 Omar L Brown
- 👤 Ermal C Fraze
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:39
CPC Classifications
B; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D17/4012
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |