Patent US3759736A successfully refreshed from Google Patents.
US3759736A
Expired / Lapsed
US
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Process for the production of nonwoven fabrics containing binders
Assignee: Sandoz AG
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Filing: 1971-03-09
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Granted: 1973-09-18
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Expires: 1991-03-09
Abstract
Abstract THIS INVENTION RELATES TO A PROCESS FOR THE PRODUCTION OF NONWOVEN FABRICS CONTAINING BINDERS SUITABLE TO BE DYED BY REACTIVE DYES INCLUDING OPTICAL BRIGHTENERS WHICH COMPRISES IMPREGNATION OF THE NONWOVEN BY MEANS OF A BINDER PREPARATION CONTAINING IN ADDITION TO THE BINDER (A) A POLYVINYL ALCOHOL, (B) REACTIVE CYCLIC METHYLOL COMPOUNDS, ALDEHYDES AND/OR COMPOUNDS YIELDING FORMALDEHYDE, (C) A METAL OR AMMONIUM SALT OF A STRONG MINERAL ACID, AND SUBSEQUENT DRYING AND CONDENSATION TREATMENT.
Inventors
- 👤 H Jenny
- 👤 J Troesch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:51
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/40; D04H1/58; D04H1/64; D04H1/645; C; C08; C08L; C08L29/00; C08L29/02; C08L29/04; D04H1/42; D04H1/4282; D04H1/4291; D04H1/43; D04H1/4326; D04H1/4334; D04H1/587; D04H1/65; D04H1/70; D04H1/74; D06; D06L; D06L4/00; D06L4/60; D06L4/657; D06M; D06M15/00; D06M15/19; D06M15/21; D06M15/327; D06M15/333; D06P; D06P1/00; D06P1/38; D06P1/44; D06P1/52; D06P1/5207; D06P1/5214; D06P1/5228; Y; Y10; Y10T; Y10T442/00; Y10T442/20; Y10T442/2582; Y10T442/2738
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-09-17 | 1977-03-19 | 1977-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-17 | 1981-03-19 | 1981-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-17 | 1985-03-19 | 1985-09-18 | $7700.00 | Window Closed / Lapsed |