Patent US4249921A successfully refreshed from Google Patents.
US3669725A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flameproofing of polyester-cellulose fibre materials
Assignee: BASF Schweiz AG
•
Filing: 1970-03-26
•
Granted: 1972-06-13
•
Expires: 1990-03-26
Abstract
Abstract A PROCESS FOR THE FLAMEPROOFING OF MIXED FIBER MATERIALS OF POLYESTER AND CELLULOSE IS PROVIDED IN WHICH AN AQUEOUS PREPARATION IS APPLIED TO THESE MATERIALS, WHICH CONTAINS A REACTION PRODUCT OF A NITROGEN COMPOUND, A PHSOPHONOPROPIONIC ACID AMIDE, FORMALDEHYDE AND OPTIONALLY AN ALKANOL. AFTERWARDS THE MATERIALS ARE DRIED AND SUBJECTED TO A HEAT TREATMENT. THE FIBER MATERIALS THEN HAVE A VERY GOOD PERMANENT FLAME RESISTANCE. PREFERRED FIBER MATERIALS ARE POLYESTER-CONTTON MIXED FABRICS.
Inventors
- 👤 Hermann Nachbur
- 👤 Joerg Kern
- 👤 Arthur Maeder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:39
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/244; D06M13/282; D06M13/292; C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4003; C07F9/4006; C08; C08G; C08G12/00; C08G12/02; C08G12/40; D06M13/288; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T442/00; Y10T442/20; Y10T442/2631; Y10T442/2672; Y10T442/268; Y10T442/2762; Y10T442/277; Y10T442/2828
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-13 | 1975-12-13 | 1976-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-13 | 1979-12-13 | 1980-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-13 | 1983-12-13 | 1984-06-13 | $7700.00 | Window Closed / Lapsed |