US4265956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic net material
Assignee: Breveteam SA
•
Filing: 1978-07-25
•
Granted: 1981-05-05
•
Expires: 1998-07-25
Abstract
Abstract A net formed from partially crystalline synthetic material is made by first forming a plurality of parallel rows of overlapping slits in a solid, biaxially oriented shrinkable sheet of plastic film, such as polypropylene. The sheet is heated to produce a film lattice through shrinkage and thereafter stretched in the longitudinal direction while maintained at a temperature below the crystalline melting point, thereby causing the web portions to be stretched into thin filaments while the intersection portions remain undrawn. The resulting net comprises rhomboid-shaped meshes defined by the filaments and intersections and is expandable in a direction transverse to the net by a multiple of the width of the net.
Inventors
- 👤 Johannes J. V. Colijn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:18
CPC Classifications
A; A01; A01G; A01G13/00; A01G13/30; A01G13/32; A01G13/10; B; B29; B29C; B29C61/00; B29C61/02; B29D; B29D28/00; B29L; B29L2028/00; Y; Y10; Y10S; Y10S264/00; Y10S264/81; Y10T; Y10T428/00; Y10T428/24; Y10T428/24149; Y10T428/24273; Y10T428/24298; Y10T428/24314; Y10T442/00; Y10T442/10; Y10T442/184
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
100 words
An expandable net for protecting plant crops and formed from a length of partially crystalline synthetic material colored by means of an optically covering pigment comprising: a mesh structure defined by a plurality configuration joined to a plurality of intersection portions of shrunk material having a flat configuration, said webs in an unexpanded condition of the net branching off in pairs from the intersection portions in the longitudinal direction with each pair of webs being substantially parallel and forming the sides of a plurality of rhomboid shapes with the intersection portions being disposed at the intersection of said rhomboid shapes.
Claim 2
Dependent Claim
100 words
An expandable net for protecting plant crops and formed from a length of partially crystalline synthetic material colored by means of an optically covering pigment comprising: a mesh structure defined by a plurality configuration joined to a plurality of intersection portions of shrunk material having a flat configuration, said webs in an unexpanded condition of the net branching off in pairs from the intersection portions in the longitudinal direction with each pair of webs being substantially parallel and forming the sides of a plurality of rhomboid shapes with the intersection portions being disposed at the intersection of said rhomboid shapes.
Claim 3
Dependent Claim
15 words
The net of claim 1 wherein the synthetic material of said mesh structure includes polypropylene.
Claim 4
Dependent Claim
63 words
The net of claim 1 wherein: (a) the ratio of the length of each web of stretched material to the length of each intersection portion of the shrunk material is between approximately 5:1 to 8:1, and (b) the ratio of the cross section width of said web to the cross section width of each said intersection portion is between approximately 1:12 and 1:20.
Claim 5
Dependent Claim
36 words
The net of claim 1 wherein the net comprising said mesh structure is expandable in a transverse direction by an amount equal to at least three times the width of the net in an unexpanded condition.
Claim 6
Dependent Claim
28 words
The net of claim 4 wherein said mesh structure is expanded to display mesh loops having approximately the same area of expanse in the longitudinal and transverse directions.
Claim 7
Dependent Claim
34 words
The net of claim 1 wherein the surfaces of the flat intersection portions of shrunk material are substantially randomly oriented out of the general plane of the net comprising the webs of stretched material.
Claim 8
Dependent Claim
14 words
The net of claim 1 wherein said synthetic material is a thermoplastic synthetic material.
References Cited (Backward Citations)
GB922131A
Cited
GB1116181A
Cited
GB1120578A
Cited
US3505157A
Cited
GB1273451A
Cited
GB1378750A
Cited
US3790652A
Cited
US4140826A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-04 | 1984-11-03 | 1985-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-04 | 1988-11-03 | 1989-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-04 | 1992-11-03 | 1993-05-05 | $7700.00 | Window Closed / Lapsed |