Patent US3588872A successfully refreshed from Google Patents.
US3271237A
Expired / Lapsed
US
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Process for the production of a fibrous polyamide laminar structure
Assignee: Glanzstoff AG
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Filing: 1964-09-15
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Granted: 1966-09-06
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Expires: 1984-09-15
Abstract
No abstract record available.
Inventors
- 👤 Sommer Erwin
- 👤 Gerlach Klaus
- 👤 Boehme Klaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:37
CPC Classifications
D; D21; D21H; D21H13/00; D21H13/10; D21H13/20; D21H13/26; D21F; D21F9/00; D21F9/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
A PROCESS FOR THE PRODUCTION OF A FIBROUS POLYAMIDE LAMINAR STRUCTURE ON A PAPERMAKING MACHINE WHICH COMPRISES: WATERLAYING POLYAMIDE FIBERS FROM AN AQUEOUS DISPERSION ONTO THE FORAMINOUS SUPPORT OF THE PAPERMAKING MACHINE, SAID FIBERS CONSISTING ESSENTIALLY OF (A) 10 TO 100% BY WEIGHT OF A COPOLYAMIDE OF CAPROLACTAM: HEXAMETHYLENE ADIPAMIDE IN A WEIGHT RATIO OF ABOUT 2:3 TO 3:1 AND (B) 90 TO 0% BY WEIGHT OF A POLYAMIDE SELECTED FROM THE GROUP CONSISTING OF POLYCAPROLACTAM AND POLYHEXAMETHYLENE ADIPAMIDE; REMOVING WATER FROM THE FIBERS TO FORM A NON-WOVEN WATELAID WEB; AND HEATING THE WATERLAID WEB IN A MOIST STATE TO A TEMPERATURE SUFFICIENT TO SOFTEN THE COPOLYAMIDE FIBERS AND CAUSE THEM TO BECOME ADHERENT.
Claim 2
Dependent Claim
114 words
A PROCESS FOR THE PRODUCTION OF A FIBROUS POLYAMIDE LAMINAR STRUCTURE ON A PAPERMAKING MACHINE WHICH COMPRISES: WATERLAYING POLYAMIDE FIBERS FROM AN AQUEOUS DISPERSION ONTO THE FORAMINOUS SUPPORT OF THE PAPERMAKING MACHINE, SAID FIBERS CONSISTING ESSENTIALLY OF (A) 10 TO 100% BY WEIGHT OF A COPOLYAMIDE OF CAPROLACTAM: HEXAMETHYLENE ADIPAMIDE IN A WEIGHT RATIO OF ABOUT 2:3 TO 3:1 AND (B) 90 TO 0% BY WEIGHT OF A POLYAMIDE SELECTED FROM THE GROUP CONSISTING OF POLYCAPROLACTAM AND POLYHEXAMETHYLENE ADIPAMIDE; REMOVING WATER FROM THE FIBERS TO FORM A NON-WOVEN WATELAID WEB; AND HEATING THE WATERLAID WEB IN A MOIST STATE TO A TEMPERATURE SUFFICIENT TO SOFTEN THE COPOLYAMIDE FIBERS AND CAUSE THEM TO BECOME ADHERENT.
References Cited (Backward Citations)
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US2962762A
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US3049466A
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US2999788A
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US3068527A
Cited
US3223581A
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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) | 1969-09-05 | 1970-03-07 | 1970-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-09-05 | 1974-03-07 | 1974-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-09-05 | 1978-03-07 | 1978-09-06 | $7700.00 | Window Closed / Lapsed |