US2993746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of thpc flame-resistant fabrics with strong mineral acids to improve theirtear strength and products produced thereby
Assignee: Individual
•
Filing: 1959-03-27
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Granted: 1961-07-25
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Expires: 1979-03-27
Abstract
No abstract record available.
Inventors
- 👤 Thomas D Miles
- 👤 Francis A Hoffman
- 👤 Armando C Delasanta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:29
CPC Classifications
D; D06; D06M; D06M15/00; D06M15/19; D06M15/37; D06M15/39; D06M15/423; D06M15/43; D06M15/431
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
IN A METHOD OF IMPROVING THE TEAR STRENGTH OF A CELLULOSIC FABRIC WHICH HAS BEEN RENDERED FLAME-RESISTANT WITH TETRAKIS-HYDROXY-METHYL PHOSPHONIUM CHLORIDE AND A METHYLOL MELAMINE RESIN, THE IMPROVEMENT WHICH COMPRISES IMMERSING THE THUS TREATED FLAME-RESISTANT FABRIC IN A DILUTE AQUEOUS SOLUTION OF A STRONG MINERAL ACID UNTIL THE CELLULOSE MOLECULES OF SAID FABRIC HAVE BEEN PARTIALLY HYDROLYZED AND THE TEAR STRENGTH OF SAID FABRIC HAS BEEN INCREASED, THEN REMOVING SAID FABRIC FROM SAID AQUEOUS SOLUTION, SUBSTANTIALLY NEUTRALIZING SAID FABRIC, AND RINSING AND DRYING SAID FABRIC.
Claim 2
Dependent Claim
85 words
IN A METHOD OF IMPROVING THE TEAR STRENGTH OF A CELLULOSIC FABRIC WHICH HAS BEEN RENDERED FLAME-RESISTANT WITH TETRAKIS-HYDROXY-METHYL PHOSPHONIUM CHLORIDE AND A METHYLOL MELAMINE RESIN, THE IMPROVEMENT WHICH COMPRISES IMMERSING THE THUS TREATED FLAME-RESISTANT FABRIC IN A DILUTE AQUEOUS SOLUTION OF A STRONG MINERAL ACID UNTIL THE CELLULOSE MOLECULES OF SAID FABRIC HAVE BEEN PARTIALLY HYDROLYZED AND THE TEAR STRENGTH OF SAID FABRIC HAS BEEN INCREASED, THEN REMOVING SAID FABRIC FROM SAID AQUEOUS SOLUTION, SUBSTANTIALLY NEUTRALIZING SAID FABRIC, AND RINSING AND DRYING SAID FABRIC.
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) | 1964-07-24 | 1965-01-23 | 1965-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-24 | 1969-01-23 | 1969-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-24 | 1973-01-23 | 1973-07-25 | $7700.00 | Window Closed / Lapsed |