US4048934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of bottom embossing
Assignee: Reynolds Metals Co
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Filing: 1976-07-29
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Granted: 1977-09-20
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Expires: 1996-07-29
Abstract
Abstract A method of bottom-embossing is described wherein a can bottom is embossed by air or lubricant that is trapped between two press elements. The can is embossed without leaving objectionable stress concentrations and provides an identification of the individual press which constructed the particular can.
Inventors
- 👤 Joseph W. Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:58
CPC Classifications
B; B21; B21D; B21D51/00; B21D51/16; B21D51/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
109 words
A method of embossing the bottom of a container of the type formed between a bottom-former element and a punch element of a can press, said method comprising the steps of: providing recessed indicia on one of said elements for indicating that said container is produced by said can press; providing a blank surface on the coactive portion of said other element; and ramming the can bottom between said punch element and said bottom-former element; and, in so doing, trapping air or lubricant adjacent said can bottom so that said indicia is embossed into said bottom by said air or lubricant without leaving objectionable stress concentrations in said bottom.
Claim 2
Independent Claim
109 words
A method of embossing the bottom of a container of the type formed between a bottom-former element and a punch element of a can press, said method comprising the steps of: providing recessed indicia on one of said elements for indicating that said container is produced by said can press; providing a blank surface on the coactive portion of said other element; and ramming the can bottom between said punch element and said bottom-former element; and, in so doing, trapping air or lubricant adjacent said can bottom so that said indicia is embossed into said bottom by said air or lubricant without leaving objectionable stress concentrations in said bottom.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein said indicia is engraved into said punch element.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein said indicia is engraved into said bottom-former element.
References Cited (Backward Citations)
US30647A
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US3056365A
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US3461699A
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US3646653A
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US3774426A
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US3895987A
Cited
US3760751A
Cited
US3756051A
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 |