Patent US2730428A successfully refreshed from Google Patents.
US2730428A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and composition for washing and bleaching fibrous materials
Assignee: "tepha" Gesellschaft fur Pharmazeutische und Chemisch-Technische Erzeugnisse M B H
•
Filing: 1951-10-16
•
Granted: 1956-01-10
•
Expires: 1971-10-16
Abstract
No abstract record available.
Inventors
- 👤 Lindner Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:39
CPC Classifications
C; C11; C11D; C11D3/00; C11D3/02; C11D3/04; C11D3/042; C11D3/16; C11D3/34; C11D3/349; C11D3/39; C11D3/3902; C11D9/00; C11D9/04; C11D9/22; C11D9/30; C11D9/32; C11D9/40; D; D06; D06L; D06L4/00; D06L4/10; D06L4/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
THE METHOD FOR WASHING AND BLEACHING FIBROUS MATERIALS SUSCEPTIBLE TO ATTACK BY OXYGEN IN ALKALINE WASHING LIQUIDS WHICH COMPRISES WASHING AND BLEACHING SUCH MATERIALS IN AN ALKALINE WASHING LIQUID CONTAINING AN ACTIVE OXYGEN EVOLVING COMPOUND AND A PROTECTIVE COMPOUND CONTAINING AN SO2 RADICAL CONNECTED DIRECTLY WITH A NITROGEN ATOM OF A BASIC NITROGEN GROUP SELECTED FROM THE GROUP CONSISTING OF SULFONAMIDES OF AMINO CARBOXYLIC ACIDS, PEPTIDES AND ALBUMEN CLEAVAGE PRODUCTS.
Claim 2
Independent Claim
70 words
THE METHOD FOR WASHING AND BLEACHING FIBROUS MATERIALS SUSCEPTIBLE TO ATTACK BY OXYGEN IN ALKALINE WASHING LIQUIDS WHICH COMPRISES WASHING AND BLEACHING SUCH MATERIALS IN AN ALKALINE WASHING LIQUID CONTAINING AN ACTIVE OXYGEN EVOLVING COMPOUND AND A PROTECTIVE COMPOUND CONTAINING AN SO2 RADICAL CONNECTED DIRECTLY WITH A NITROGEN ATOM OF A BASIC NITROGEN GROUP SELECTED FROM THE GROUP CONSISTING OF SULFONAMIDES OF AMINO CARBOXYLIC ACIDS, PEPTIDES AND ALBUMEN CLEAVAGE PRODUCTS.
References Cited (Backward Citations)
US1980414A
Cited
US1990852A
Cited
FR538492A
Cited
DE387594C
Cited
DE434979C
Cited
US1927363A
Cited
GB380851A
Cited
GB415718A
Cited
US2033219A
Cited
US2213477A
Cited
CH197839A
Cited
US2427097A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-01-09 | 1959-07-11 | 1960-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-01-09 | 1963-07-11 | 1964-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-01-09 | 1967-07-11 | 1968-01-10 | $7700.00 | Window Closed / Lapsed |