US3630816A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonwoven sheets made from rectangular cross section monofilaments
Assignee: Chevron USA Inc
•
Filing: 1969-07-25
•
Granted: 1971-12-28
•
Expires: 1989-07-25
Abstract
Abstract Nonwoven sheets of continuous synthetic polymer, e.g., stereoregular polypropylene, monofilaments which have elongated, e.g., rectangular, cross sections with aspect ratios of at least about 3:1 and are disposed randomly and are substantially discrete from each other except at crossover points in the sheet. These sheets may be made by extruding the polymer through appropriately shaped orifices, partially cooling the resulting monofilaments, drawing them with a pneumatic jet and depositing them on a collecting device.
Inventors
- 👤 Phillip H Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:12
CPC Classifications
D; D04; D04H; D04H3/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/29; Y10T428/2913; Y10T428/2973; Y10T442/00; Y10T442/60; Y10T442/608; Y10T442/609; Y10T442/611
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
16 words
The nonwoven sheet of claim 1 wherein the cross sections of the monofilaments are substantially rectangular.
Claim 2
Dependent Claim
20 words
The nonwoven sheet of claim 1 wherein the individual cross-sectional areas of the monofilaments are about 0.00005 to 0.008 mm.2.
Claim 3
Dependent Claim
14 words
The nonwoven sheet of claim 1 wherein the polymer is substantially crystalline, stereoregular polypropylene.
Claim 4
Dependent Claim
45 words
The nonwoven sheet of claim 1 wherein the polymer is substantially crystalline, stereoregular polypropylene, the cross sections of the monofilaments are substantially rectangular and have individual areas of about 0.00005 to 0.008 mm.2 and the aspect ratio is in the range of 3:1 and 8:1.
References Cited (Backward Citations)
US2456922A
Cited
US2620853A
Cited
US2825120A
Cited
US3109278A
Cited
US3109220A
Cited
US3402548A
Cited
US3164949A
Cited
US3396071A
Cited
US3360421A
Cited
US3322607A
Cited
US3533904A
Cited
US3547763A
Cited
US3492389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |