US2983568A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching peroxide impregnated cellulosic fabrics by contact with a dry heated body
Assignee: FMC Corp
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Filing: 1958-08-18
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Granted: 1961-05-09
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Expires: 1978-08-18
Abstract
No abstract record available.
Inventors
- 👤 Francis X Nerney
- 👤 Bernard K Easton
- 👤 Weinberg Norbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:08
CPC Classifications
D; D06; D06L; D06L4/00; D06L4/10
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
141 words
METHOD OF BLEACHING A CELLULOSE FABRIC, COMPRISING IMPREGNATING SAID FABRIC WITH AN AQUEOUS HYDROGEN PEROXIDE SOLUTION HAVING A PH OF ABOUT 8.5 TO 10 AND CONTAINING BY WEIGHT ABOUT 1% TO 1.75% OF HYDROGEN PEROXIDE, ABOUT 2 TO 4% OF A MOLECULARLY DEHYDRATED SALT OF PHOSPHORIC ACID, FROM THE GROUP CONSISTING OF SODIUM TRIPOLYPHOSPHATE, SODIUM HEXAMETAPHOSPHATE, AND TETRASODIUM PYROPHOSPHATE, AND ABOUT 0.3 TO 0.6% OF A SEQUESTERING AGENT, WHEREBY SAID FABRIC TAKES UP ABOUT 80 TO 120% OF ITS OWN WEIGHT OF SAID SOLUTION HEATING THE RESULTING WETTED FABRIC BY CONTACT WITH A HEATED DRYING SURFACE TO ABOUT 100*C. TO 135*C. FOR ABOUT 20 TO 90 SECONDS TO REMOVE AT LEAST ABOUT 90% OF THE WATER PRESENT ON SAID WETTED FABRIC, AND WITHIN ABOUT 16 HOURS AFTER SAID HEATING HAS BEEN COMPLETED, WASHING RESIDUAL CHEMICALS OUT OF SAID FABRIC WITH WATER.
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) | 1964-05-08 | 1964-11-07 | 1965-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-08 | 1968-11-07 | 1969-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-08 | 1972-11-07 | 1973-05-09 | $7700.00 | Window Closed / Lapsed |