US3635667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drycleaning with hydrogen peroxide
Assignee: FMC Corp
•
Filing: 1970-07-23
•
Granted: 1972-01-18
•
Expires: 1990-07-23
Abstract
Abstract Drycleaning of white garments is carried out by including, in conventional solvent-detergent baths, hydrogen peroxide, water, and sufficient volatile alkali (e.g. ammonia) to make the water phase slightly alkaline, using limiting ratios of the ingredients to insure adequate bleaching without damage to the fabric.
Inventors
- 👤 Robert E Keay
- 👤 Harry M Castrantas
- 👤 Donald G Mackellar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 19:32
CPC Classifications
D; D06; D06L; D06L1/00; D06L1/02; D06L1/04; D06L4/00; D06L4/10; D06L4/12; D06L4/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
The method of claim 1, in which the hydrogen peroxide content is between 0.5 and 1.5 percent, the water is between 2.0 and 10.0 percent, and the aqueous alkali is sufficient to bring the pH to 8.5.
Claim 2
Dependent Claim
13 words
The method of claim 1, in which the aqueous alkali is ammonium hydroxide.
References Cited (Backward Citations)
US2886532A
Cited
US3042479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |