Patent US4013752A successfully refreshed from Google Patents.
US4013752A
Expired / Lapsed
US
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Method of manufacturing reticulate sheet material
Assignee: Johnson and Johnson
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Filing: 1972-02-09
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Granted: 1977-03-22
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Expires: 1992-02-09
Abstract
Abstract A method of manufacturing a reticulate polymer sheet having a set of filaments extending across the sheet and intersecting in molecularly oriented integral junctures with a second set of filaments comprising stretching a net-like structure in the longitudinal direction at least 3 to 1 and in the transverse direction at least 4 to 1 to provide a total stretch of from 12 to 1 to 40 to 1 to substantially uniformly molecularly orient the entire sheet.
Inventors
- 👤 Frank Kalwaites
- 👤 Peter L. Doviak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:52
CPC Classifications
B; B29; B29D; B29D28/00; B29C; B29C55/00; B29C55/02; B29C55/10; B29C55/12; B29C55/14; B29C55/146; Y; Y10; Y10S; Y10S264/00; Y10S264/47; Y10S264/81
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
139 words
A method for manufacturing a reticulate, polymer, sheet having a set of filaments extending across the sheet and intersecting in molecularly oriented integral junctures with a second set of filaments comprising: 1. Heating a film of molecularly orientable, thermally stable, oxidation resistant synthetic polymer; 2. Embossing said heated film to form a net like structure of substantially unoriented ribs and junctures which define a uniform pattern of openings throughout the structure, said ribs and junctures having substantially uniform cross-sectional areas throughout the structure; and 3. Stretching the embossed film in the longitudinal direction at a ratio of at least 3:1 and in the transverse direction at a ratio of at least 4:1 so that the total area stretch of the structure is from 12:1 to 40:1, whereby the ribs and junctures are substantially uniformly molecularly oriented throughout said sheet.
Claim 2
Independent Claim
139 words
A method for manufacturing a reticulate, polymer, sheet having a set of filaments extending across the sheet and intersecting in molecularly oriented integral junctures with a second set of filaments comprising: 1. Heating a film of molecularly orientable, thermally stable, oxidation resistant synthetic polymer; 2. Embossing said heated film to form a net like structure of substantially unoriented ribs and junctures which define a uniform pattern of openings throughout the structure, said ribs and junctures having substantially uniform cross-sectional areas throughout the structure; and 3. Stretching the embossed film in the longitudinal direction at a ratio of at least 3:1 and in the transverse direction at a ratio of at least 4:1 so that the total area stretch of the structure is from 12:1 to 40:1, whereby the ribs and junctures are substantially uniformly molecularly oriented throughout said sheet.
Claim 3
Dependent Claim
23 words
The method according to claim 1 wherein the embossed film is stretched in the longitudinal direction at a ratio of at least 4:1.
Claim 4
Dependent Claim
35 words
A method according to claim 1 wherein the embossed film is stretched in the longitudinal direction at a ratio of at least 3.6:1 and in the transverse direction at a ratio of at least 8:1.
Claim 5
Dependent Claim
17 words
A method according to claim 1 wherein the embossed film is initially stretched in the longitudinal direction.
Claim 6
Dependent Claim
12 words
A method according to claim 1 wherein the polymer is isotactic polypropylene.
Claim 7
Dependent Claim
13 words
A method according to claim 1 wherein the polymer is high density polyethylene.
Claim 8
Dependent Claim
11 words
A method according to claim 1 wherein the polymer is polycaprolactam.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |