US2876524A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of altering the physical characteristics of linear condensation polymers withanhydrous hydrogen halide gas
Assignee: University of Minnesota Twin Cities
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Filing: 1954-12-08
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Granted: 1959-03-10
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Expires: 1974-12-08
Abstract
No abstract record available.
Inventors
- 👤 Lloyd H Reyerson
- 👤 Lowell E Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:54
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/07; D06M11/11; Y; Y10; Y10S; Y10S8/00; Y10S8/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A METHOD OF IMPARTING A PERMANENT CURL TO NYLON YARNS WHICH COMPRISES SUBJECTING THE YARNS TO THE DESIRED NEW CURLED CONFIGURATION, EXPOSING THE YARNS WHILE SO SUBJECTED TO AN ATMOSPHERE OF SUBSTANTIALLY ANHYDROUS HYDROGEN CHLORIDE GAS IN A CLOSED TREATING ZONE AT A , TEMPERATURE BETWEEN ABOUT ROOM TEMPERATURE AND -80* C. AND AT A PRESSURE BETWEEN ABOUT 1MM. HG AND ABOUT 100 CM. HG FOR A PERIOD OF TIME SUFFICIENT TO PERMIT THE SORPTION OF AT LEAST FROM ABOUT 1/2 TO 2 1/2 MOLES OF HYDROGEN CHLORIDE GAS PER MOLE OF AMIDE LINKAGES IN THE NYLON, AND THEN DESORBING THE HYDROGEN CHLORIDE FROM THE YARNS IN VACUO AT AN ELEVATED TEMPERATURE BELOW THE SOFTENING POINT OF THE YARNS.
Claim 2
Independent Claim
119 words
A METHOD OF IMPARTING A PERMANENT CURL TO NYLON YARNS WHICH COMPRISES SUBJECTING THE YARNS TO THE DESIRED NEW CURLED CONFIGURATION, EXPOSING THE YARNS WHILE SO SUBJECTED TO AN ATMOSPHERE OF SUBSTANTIALLY ANHYDROUS HYDROGEN CHLORIDE GAS IN A CLOSED TREATING ZONE AT A , TEMPERATURE BETWEEN ABOUT ROOM TEMPERATURE AND -80* C. AND AT A PRESSURE BETWEEN ABOUT 1MM. HG AND ABOUT 100 CM. HG FOR A PERIOD OF TIME SUFFICIENT TO PERMIT THE SORPTION OF AT LEAST FROM ABOUT 1/2 TO 2 1/2 MOLES OF HYDROGEN CHLORIDE GAS PER MOLE OF AMIDE LINKAGES IN THE NYLON, AND THEN DESORBING THE HYDROGEN CHLORIDE FROM THE YARNS IN VACUO AT AN ELEVATED TEMPERATURE BELOW THE SOFTENING POINT OF THE YARNS.
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) | 1962-03-09 | 1962-09-08 | 1963-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-09 | 1966-09-08 | 1967-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-09 | 1970-09-08 | 1971-03-10 | $7700.00 | Window Closed / Lapsed |