Patent US5342393A successfully refreshed from Google Patents.
Patent US3704198A successfully refreshed from Google Patents.
US3704198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonwoven polypropylene mats of increased strip tensile strength
Assignee: ExxonMobil Technology and Engineering Co
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Filing: 1969-10-09
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Granted: 1972-11-28
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Expires: 1989-10-09
Abstract
Abstract THE STRIP TENSILE STRENGTH OF NONWOVEN MATS OF POLYPROPYLENE FIBERS HAVING A DIAMETER FROM ABOUT 1 TO ABOUT 10 MICRONS IS INCREASED, FOR EXAMPLE, TO STRENGTHS GREATER THAN 4000 M., BY FUSE-BONDING, AS BY CALENDERING OR POINT-BOILING, AT LEAST A PORTION OF THE FIBERS OF THE MAT AT TEMPERATURES WITHIN THE RANGE FROM ABOUT 250*F. TO ABOUT 325*F., PREFERABLY, FROM ABOUT 280*F. TO ABOUT 315*F., WHILE THE MAT IS SUBJECTED TO PRESSURE SUFFICIENT TO PREVENT SHRINKAGE OF THE FIBERS IN THE MAT.
Inventors
- 👤 James S Prentice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:20
CPC Classifications
D; D04; D04H; D04H3/00; D04H3/08; D04H3/16; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24802; Y10T428/24826; Y10T428/26; Y10T428/263
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-11-28 | 1976-05-29 | 1976-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-28 | 1980-05-29 | 1980-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-28 | 1984-05-29 | 1984-11-28 | $7700.00 | Window Closed / Lapsed |