US3607411A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prestretched expanded metal and method of making it
Assignee: Exmet Corp
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Filing: 1968-03-21
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Granted: 1971-09-21
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Expires: 1988-03-21
Abstract
Abstract After production of expanded metal in substantially the usual way, sheet is stretched longitudinally until the strands in at least some of the rows become substantially longitudinally aligned. Punch may be shifted a distance equal to about one-third the tooth width to produce asymmetric diamond-shaped openings prior to stretching. Sheet may be bent longitudinally upon itself along a row of aligned strands to yield a smooth edge. Electrode may be formed by applying a chemically active powder to sheet.
Inventors
- 👤 John A Brownrigg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:09
CPC Classifications
B; B21; B21D; B21D31/00; B21D31/04; B21D31/043; H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/70; H01M4/72; H01M4/74; H01M4/745; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T29/00; Y10T29/18; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
40 words
A sheet of expanded metal as defined in claim 1 wherein the longitudinal axes of all the strands along each side of each row of openings are substAntially aligned and substantially parallel to all the other aligned rows of strands.
Claim 2
Dependent Claim
28 words
A sheet of expanded metal as defined in claim 2 wherein all said substantially aligned strands are substantially perpendicular to the connecting bridges to which they are connected.
Claim 3
Dependent Claim
37 words
A sheet of expanded metal as defined in claim 1 wherein the longitudinal axes of the strands in only every other row are substantially aligned, the strands in the alternate rows being arranged in a sawtooth pattern.
Claim 4
Dependent Claim
72 words
A sheet of expanded metal as defined in claim 4 wherein said connecting bridges are arranged in longitudinally spaced-apart transverse rows, each strand of the sawtooth pattern extending between a connecting bridge located at the intersection of one of said transverse rows and one of said aligned rows of strands and another connecting bridge located at the intersection of the next successive transverse row and the next successive aligned row of strands.
Claim 5
Dependent Claim
28 words
A sheet of expanded metal as defined in claim 5 wherein each two successive strands of the sawtooth pattern are arranged at an obtuse angle to each other.
Claim 6
Dependent Claim
37 words
A sheet of expanded metal as defined in claim 1, said sheet being bent upon itself along a longitudinal row of aligned strands, said row of aligned strands thereby forming a smooth longitudinal edge of the sheet.
Claim 7
Independent Claim
113 words
A method of making a sheet of expanded metal comprising the steps of advancing sheet metal along its longitudinal axis in stepwise fashion relative to a toothed punch, operating the punch between each two successive advancing steps to partially sever the sheet thereby providing parallel rows of openings, said rows of openings being parallel to said longitudinal axis and each opening defined by a series of strands separated by connecting bridges said bridges being substantially perpendicular to the longitudinal axis, and thereafter stretching the expanded metal sheet in said longitudinal direction beyond its elastic limit until the longitudinal axes of the strands in at least some of the rows become substantially longitudinally aligned.
Claim 8
Dependent Claim
37 words
A method as defined in claim 8 wherein the punch is shifted laterally a distance other than a whole number multiple of one-half the width of one punch tooth between each two successive operations of the punch.
Claim 9
Dependent Claim
33 words
A method as defined in claim 8 wherein the punch is shifted laterally a distance about equal to one-third the width of one punch tooth between each two successive operations of the punch.
Claim 10
Dependent Claim
93 words
An electrode for an electrochemical cell, comprising a sheet of expanded metal having openings delimited by strands defining the lateral boundaries of the openings and connecting bridges between the strands defining the forward and rearward boundaries of the openings, the longitudinal axes of all the strands along at least one side of each row of openings being substantially aligned and substantially parallel to all the other aligned rows of strands, the longitudinal axes of said aligned strands extending along the longitudinal direction of the sheet, and a chemically active powder within said openings.
Claim 11
Dependent Claim
25 words
An electrode as defined in claim 11 wherein said powder is selected from the class consisting of zinc, silver, nickel, zinc oxide, and silver oxide.
Claim 12
Independent Claim
144 words
A method of making a sheet of expanded metal comprising the steps of advancing sheet metal along its longitudinal axis in stepwise fashion relative to a toothed punch, operating the punch between each two successive advancing steps to partially sever the sheet thereby providing parallel rows of openings, said rows of openings being parallel to said longitudinal axis and each opening defined by a series of strands connected at their ends to connecting bridges said bridges being substantially perpendicular to the longitudinal axis, the strands being arranged at an angle to the longitudinal direction of advance of the sheet, thereafter stretching the expanded metal sheet in said longitudinal direction to cause rotation of the strands about theiR ends, and continuing said stretching until said rotation ceases and the longitudinal axes of the strands in at least some of the rows become substantially longitudinally aligned.
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) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |