US3563199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Can top construction and method of fabrication
Assignee: Hunt Foods and Industries Inc
•
Filing: 1968-07-15
•
Granted: 1971-02-16
•
Expires: 1988-07-15
Abstract
Abstract A tear strip for a can top is formed by first forming a narrow groove having a central portion which defines the tear strip edge and inclined walls on the opposite sides of such central portion, and thereafter scoring the central portion of the groove to form the tear strip. The stress attendant to scoring is absorbed by the inclined opposite walls rather than being transmitted to the remainder of the can top metal.
Inventors
- 👤 Wayne F Wolfe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:53
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/38; B21D51/383; B60; B60C; B60C9/00; B60C9/0042; B65; B65D; B65D17/00; B65D17/28; B65D17/401; B65D17/4012; B65D17/404; Y; Y10; Y10S; Y10S57/00; Y10S57/902; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495; Y10T152/10765; Y10T152/10801
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
The method of forming a scored tear strip on a steel can end, comprising the steps of: forming an elongate narrow groove in a steel sheet, said groove having a central portion defining an edge of the tear strip and a pair of inclined walls on opposite sides of the central portion; and after said groove has been formed, scoring the central portion of the groove so that the stress resulting from the stamping is absorbed in the inclined walls rather than being transmitted to the remainder of the sheet.
Claim 2
Independent Claim
90 words
The method of forming a scored tear strip on a steel can end, comprising the steps of: forming an elongate narrow groove in a steel sheet, said groove having a central portion defining an edge of the tear strip and a pair of inclined walls on opposite sides of the central portion; and after said groove has been formed, scoring the central portion of the groove so that the stress resulting from the stamping is absorbed in the inclined walls rather than being transmitted to the remainder of the sheet.
Claim 3
Independent Claim
104 words
The method of forming a scored tear strip on a can end, comprising the steps of: forming an elongate narrow groove in a metal sheet, said groove having a central portion defining an edge of the tear strip and a pair of inclined walls on opposite sides of the central portion; gripping the sheet adjacent the groove; and scoring the central portion of the groove of the gripped sheet after the groove has been formed so that the stress resulting from the stamping is absorbed in the inclined walls rather than being transmitted to the remainder of the sheet or to the tear strip.
Claim 4
Independent Claim
104 words
The method of forming a scored tear strip on a can end, comprising the steps of: forming an elongate narrow groove in a metal sheet, said groove having a central portion defining an edge of the tear strip and a pair of inclined walls on opposite sides of the central portion; gripping the sheet adjacent the groove; and scoring the central portion of the groove of the gripped sheet after the groove has been formed so that the stress resulting from the stamping is absorbed in the inclined walls rather than being transmitted to the remainder of the sheet or to the tear strip.
Claim 5
Independent Claim
110 words
A method of forming a can end having a manually removable tear strip thereon, including the following steps in the order recited: clamping a relatively thin steel sheet on opposite sides of at least one elongate portion; forming an elongate buffering groove in said elongate portion of the clamped sheet having opposite sidewalls inclined at between about 60* and 90* with respect to the major portion of the lid, and a central wall joining the sidewalls; clamping the sheet on opposite sides of the groove; and stamping a score in the central wall of said groove of the clamped sheet to define the edges of a manually removable tear strip.
Claim 6
Independent Claim
110 words
A method of forming a can end having a manually removable tear strip thereon, including the following steps in the order recited: clamping a relatively thin steel sheet on opposite sides of at least one elongate portion; forming an elongate buffering groove in said elongate portion of the clamped sheet having opposite sidewalls inclined at between about 60* and 90* with respect to the major portion of the lid, and a central wall joining the sidewalls; clamping the sheet on opposite sides of the groove; and stamping a score in the central wall of said groove of the clamped sheet to define the edges of a manually removable tear strip.
Claim 7
Dependent Claim
44 words
The method of forming a scored tear strip on a steel can end in accordance with claim 1 wherein the step of forming the groove includes the step of forming the groove to a depth at least several times the thickness of the sheet.
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |