US3650866A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Increasing strip tensile strength of melt blown nonwoven polypropylene mats of high tear resistance
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1969-10-09
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Granted: 1972-03-21
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Expires: 1989-10-09
Abstract
Abstract The strip tensile strength of a highly tear resistant nonwoven mat of melt blown polypropylene fibers having a diameter between about 10-40 microns is increased, while maintaining a high mat tear resistance, by fuse-bonding, as by calendering or pointbonding, at least a portion of the fibers of the mat at temperatures not greater than about 225* F., preferably, between about 170*-210* F., under pressure sufficient to prevent shrinkage of the fibers of the mat.
Inventors
- 👤 James S Prentice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:36
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; B; B29; B29C; B29C43/00; B29C43/006; B29K; B29K2105/00; B29K2105/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
15 words
The process of claim 2 wherein said temperature is between about 170* - 225* F.
Claim 2
Dependent Claim
12 words
The process of claim 1 in which said fuse-bonding is by calendering.
Claim 3
Dependent Claim
12 words
The process of claim 1 in which said fuse-bonding is by point-bonding.
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |