Patent US3385916A successfully refreshed from Google Patents.
US3385916A
Expired / Lapsed
US
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Process for producing microporous polyurethane fibrids
Assignee: EIDP Inc
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Filing: 1965-11-03
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Granted: 1968-05-28
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Expires: 1985-11-03
Abstract
No abstract record available.
Inventors
- 👤 Esperanza G Parrish
- 👤 Farago John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:03
CPC Classifications
D; D01; D01D; D01D5/00; D01D5/40; D01D5/42; D01D5/423; D06; D06N; D06N3/00; D06N3/0002; D06N3/0004; D21; D21H; D21H5/00; D21H5/12; D21H5/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
55 words
A PROCESS FOR THE PRODUCTION OF MICROPOROUS POLYURETHANE FIBRIDS WHICH COMPRISES (A) FORMING A POLYURETHANE PREPOLYMER SOLUTION HAVING A RADICAL SPREAD RATE OF ABOUT 1 TO 40 CENTIMETERS/SECOND IN WHICH IN PREPOLYMER IS FORMED FROM AN ACTIVE-HYDROGEN CONTAINING MATERIAL AND IN WHICH THE TERMINAL GROUPS OF THE PREPOLYMER ARE SELECTED FROM THE GROUP CONSISTING OF
Claim 2
Dependent Claim
55 words
A PROCESS FOR THE PRODUCTION OF MICROPOROUS POLYURETHANE FIBRIDS WHICH COMPRISES (A) FORMING A POLYURETHANE PREPOLYMER SOLUTION HAVING A RADICAL SPREAD RATE OF ABOUT 1 TO 40 CENTIMETERS/SECOND IN WHICH IN PREPOLYMER IS FORMED FROM AN ACTIVE-HYDROGEN CONTAINING MATERIAL AND IN WHICH THE TERMINAL GROUPS OF THE PREPOLYMER ARE SELECTED FROM THE GROUP CONSISTING OF
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) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |