US3345253A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of forming cellulosic webs containing urea-alkyleneimine condensation products
Assignee: Hoechst AG
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Filing: 1964-08-27
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Granted: 1967-10-03
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Expires: 1984-08-27
Abstract
No abstract record available.
Inventors
- 👤 Bestian Herbert
- 👤 Sommer Hans
- 👤 Bergmann Dieter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:33
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; C; C08; C08L; C08L75/00; C08L75/02; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/61; D06P; D06P5/00; D06P5/22; D06P5/225; D21H17/03; D21H17/05; D21H17/07; D21H17/46; D21H17/54; D21H17/57
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
THE PROCESS FOR PREPARING CELLULOSIC FIBROUS MATERIALS HAVING INCREASED WET TENSILE STRENGTH, WHEREIN TO THE FIBROUS MATERIAL IN AQUEOUS SUSPENSION IS ADDED 0.1 TO 4% ON BASIS OF THE DRY FIBROUS MATERIAL A NITROGEN-CONTAINING CONDENSATION PRODUCT OF 0.25 TO 1.5 MOLE TO 1 MOLE, RESPECTIVELY, OF UREA AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF 1,2-ALKYLENEIMINES, OLIGOMERS OF 1,2-ALKYLENEIMINES, AND MIXTURES OF 1,2-ALKYLENEIMINES AND THEIR OLIGOMERS, AND THEREAFTER DEWATERING SAID SUSPENSION, SHEETING THE FIBROUS MATERIAL AND DRYING THE SHEETED MATERIAL.
Claim 2
Dependent Claim
81 words
THE PROCESS FOR PREPARING CELLULOSIC FIBROUS MATERIALS HAVING INCREASED WET TENSILE STRENGTH, WHEREIN TO THE FIBROUS MATERIAL IN AQUEOUS SUSPENSION IS ADDED 0.1 TO 4% ON BASIS OF THE DRY FIBROUS MATERIAL A NITROGEN-CONTAINING CONDENSATION PRODUCT OF 0.25 TO 1.5 MOLE TO 1 MOLE, RESPECTIVELY, OF UREA AND A MEMBER SELECTED FROM THE GROUP CONSISTING OF 1,2-ALKYLENEIMINES, OLIGOMERS OF 1,2-ALKYLENEIMINES, AND MIXTURES OF 1,2-ALKYLENEIMINES AND THEIR OLIGOMERS, AND THEREAFTER DEWATERING SAID SUSPENSION, SHEETING THE FIBROUS MATERIAL AND DRYING THE SHEETED MATERIAL.
References Cited (Backward Citations)
GB466345A
Cited
US3234025A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |