Patent US3840952A successfully refreshed from Google Patents.
US3840952A
Expired / Lapsed
US
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Method and apparatus for making expanded metal sheets
Assignee: John Lysaght Australia Pty Ltd
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Filing: 1972-10-30
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Granted: 1974-10-15
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Expires: 1992-10-30
Abstract
Abstract A method of making an expanded metal sheet comprising the steps of stamping successive adjacent strips of a plain metal sheet to sever each strip from the plain sheet except at a plurality of spaced apart positions, and deforming the metal of the strip intermediate those positions characterized in that two separate dies of mutually different profile are alternately utilized for the steps.
Inventors
- 👤 M North
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 06:53
CPC Classifications
B; B21; B21D; B21D31/00; B21D31/04; B21D31/043; Y; Y10; Y10T; Y10T29/00; Y10T29/18; Y10T29/185
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
65 words
A method of making an expanded metal sheet comprising the steps of stamping successive adjacent strips of a plain metal sheet to sever each strip from the plain sheet except at a plurality of spaced apart positions, and deforming the metal of the strip intermediate those positions characterised in that separate dies of mutually different profile are utilised for each of any two consecutive steps.
Claim 2
Independent Claim
65 words
A method of making an expanded metal sheet comprising the steps of stamping successive adjacent strips of a plain metal sheet to sever each strip from the plain sheet except at a plurality of spaced apart positions, and deforming the metal of the strip intermediate those positions characterised in that separate dies of mutually different profile are utilised for each of any two consecutive steps.
Claim 3
Dependent Claim
12 words
A method according to claim 1 wherein two dies are used alternately.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |