US2802767A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of preparing fibrous, non-woven, porous sheets
Assignee: EIDP Inc
•
Filing: 1954-05-18
•
Granted: 1957-08-13
•
Expires: 1974-05-18
Abstract
No abstract record available.
Inventors
- 👤 Harold R Mighton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:08
CPC Classifications
B; B29; B29C; B29C70/00; B29C70/04; B29C70/06; B29C70/10; B29C70/12; D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/60; D06; D06N; D06N3/00; D06N3/0002; D06N3/0015; D06N3/0034; D06N3/007; D06N3/0077; D06N3/04; D06N3/10; D06N3/106; B29K; B29K2105/00; B29K2105/06; B29K2105/12; B29K2105/128; D06N2207/00; D06N2207/06; D06N2209/00; D06N2209/12; D06N2209/121; Y; Y10; Y10S; Y10S264/00; Y10S264/61
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
131 words
THE PROCESS WHICH COMPRISES ASSOCIATING LIQUIDSWELLABLE STRUCTURAL FIBERS AND SOFT, ELASTOMERIC, INITIALLY THERMOSPLASTIC POLYMERIC BINDER MATERIAL, HAVING A SOFTENING TEMPERATURE BELOW THE SOFTENING TEMPERATURE OF SAID FIBERS TO FORM AN INITIAL SHET, HOT-PRESSING SAID INITIAL SHEET AT A TEMPERATURE ABOVE THE SOFTENING TEMPERATURE OF SAID BINDER AND BELOW THE SOFTENING TEMPERATURE OF SAID FIBERS WHEREBY STO FORM A SUBSTANTIALLY WATER VAPORIMPERMEABLE COMPOSITE SHEET, AND THEREAFTER RENDERING SAID COMPOSITE SHEET WATER VAPOSR-PERMEABLE BY (1) SOAKING SAID COMPOSITE SHEET AT A TEMPERATURE BETWEEN STHE SOFTENING TEMPERATURE OF SAID BINDER AND OF SAID FIBERS IN A LIQUID WHICH SWELLS SAID FIBERS AND THEREAFTER DRYING SAID COMPOSITE SHEET AT A TEMPERATURE NO HIGHER STHAN THE SOFTENING TEMPERATURE OF THE BINDER TO REMOVE SAID LIQUID, AND (2) STRETCHING SAID COMPOSITE SHEET AND THEREAFTER RELAXING THE SAME.
Claim 2
Dependent Claim
131 words
THE PROCESS WHICH COMPRISES ASSOCIATING LIQUIDSWELLABLE STRUCTURAL FIBERS AND SOFT, ELASTOMERIC, INITIALLY THERMOSPLASTIC POLYMERIC BINDER MATERIAL, HAVING A SOFTENING TEMPERATURE BELOW THE SOFTENING TEMPERATURE OF SAID FIBERS TO FORM AN INITIAL SHET, HOT-PRESSING SAID INITIAL SHEET AT A TEMPERATURE ABOVE THE SOFTENING TEMPERATURE OF SAID BINDER AND BELOW THE SOFTENING TEMPERATURE OF SAID FIBERS WHEREBY STO FORM A SUBSTANTIALLY WATER VAPORIMPERMEABLE COMPOSITE SHEET, AND THEREAFTER RENDERING SAID COMPOSITE SHEET WATER VAPOSR-PERMEABLE BY (1) SOAKING SAID COMPOSITE SHEET AT A TEMPERATURE BETWEEN STHE SOFTENING TEMPERATURE OF SAID BINDER AND OF SAID FIBERS IN A LIQUID WHICH SWELLS SAID FIBERS AND THEREAFTER DRYING SAID COMPOSITE SHEET AT A TEMPERATURE NO HIGHER STHAN THE SOFTENING TEMPERATURE OF THE BINDER TO REMOVE SAID LIQUID, AND (2) STRETCHING SAID COMPOSITE SHEET AND THEREAFTER RELAXING THE SAME.
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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) | 1960-08-12 | 1961-02-11 | 1961-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-08-12 | 1965-02-11 | 1965-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-08-12 | 1969-02-11 | 1969-08-13 | $7700.00 | Window Closed / Lapsed |