US3994682A
Expired / Lapsed
US
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Two-step washing method for textiles
Assignee: Roehm GmbH Darmstadt
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Filing: 1975-06-26
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Granted: 1976-11-30
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Expires: 1995-06-26
Abstract
Abstract A two-step method for washing textiles which comprises washing said textiles in a first step with an aqueous bath containing both a cationic surface-active agent and a non-ionogenic surface-active agent, and then washing said textiles in a second step with an aqueous bath containing conventional builders and an anionic surface-active agent, a non-ionogenic surface-active agent, or both.
Inventors
- 👤 Hans Braun
- 👤 Hans Kraus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 21:10
CPC Classifications
D; D06; D06L; D06L1/00; D06L1/12; D06L1/16; G; G03; G03C; G03C7/00; G03C7/30; G03C7/42; G03C7/421
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
58 words
A two-step method for washing textiles which consists of washing said textiles in a first step with an aqueous bath containing both a cationic surface-active agent and a non-ionogenic surface-active agent, and then washing said textiles in a second step with an aqueous bath containing conventional builders and an anionic surface-active agent, a non-ionogenic surface-active agent, or both.
Claim 2
Dependent Claim
58 words
A two-step method for washing textiles which consists of washing said textiles in a first step with an aqueous bath containing both a cationic surface-active agent and a non-ionogenic surface-active agent, and then washing said textiles in a second step with an aqueous bath containing conventional builders and an anionic surface-active agent, a non-ionogenic surface-active agent, or both.
Claim 3
Dependent Claim
23 words
A method as in claim 1 wherein said cationic surface-active agent is a salt of a primary aliphatic amine having a hydrophobic group.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-30 | 1980-05-31 | 1980-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-30 | 1984-05-31 | 1984-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-30 | 1988-05-31 | 1988-11-30 | $7700.00 | Window Closed / Lapsed |