US3075823A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating water-insoluble linear polyamide condensation polymers with anhydrous hydrogen halide gas and then moisture to hydrolyze the polyamide surface
Assignee: University of Minnesota Twin Cities
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Filing: 1957-08-21
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Granted: 1963-01-29
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Expires: 1977-08-21
Abstract
No abstract record available.
Inventors
- 👤 Lloyd H Reyerson
- 👤 Lowell E Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:31
CPC Classifications
D; D06; D06M; D06M11/00; D06M11/07; D06M11/11; Y; Y10; Y10S; Y10S260/00; Y10S260/21; Y10S8/00; Y10S8/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
137 words
A METHOD OF ALTERING THE PHYSICAL SURFACE CHARACTERISTICS OF WATER-INSOLUBLE LINEAR POLYAMIDE CONDENSATION POLYMERS WHICH COMPRISES EXPOSING SAID POLYMERS TO A SUBSTANTIALLY ANHYDROUS HYDROGEN HALIDE IN GASEOUS MOLECULAR FORM FOR A PERIOD BETWEEN ABOUT 1/2 SECOND AND 120 MINUTES, AT A TEMPERATURE BETWEEN ABOUT -80* C. AND 1104*C., A GAS CONCENTRATION BETWEEN ABOUT 30 AND 100 PERCENT BY WEIGHT AND A PRESSURE BETWEEN ABOUT 1 MM. AND 100 CM HG TO CAUSE A SURFACE SORPTION ONLY OF SAID HYDROGEN HALIDE GAS MOLECULES BY THE POLYMERS TO BREAK THE HYDROGEN BONDS BETWEEN THE ADJOINING POLYAMIDE CHAIN IN THE POLYMER SURFACES AND THEN, WHILE SAID HYDROGEN HALIDE GAS MOLECULES ARE SORBED AT THE POLYMER SURFACE, EXPOSING THE HYDROGEN HALIDE TREATED SURFACES TO MOISTURE TO HYDROLYZE THE CARBONYL-AMIDE LINKAGES BETWEEN THE LINKS IN THE POLYAMIDE CHAINS IN THE POLYMER SURFACES.
Claim 2
Independent Claim
137 words
A METHOD OF ALTERING THE PHYSICAL SURFACE CHARACTERISTICS OF WATER-INSOLUBLE LINEAR POLYAMIDE CONDENSATION POLYMERS WHICH COMPRISES EXPOSING SAID POLYMERS TO A SUBSTANTIALLY ANHYDROUS HYDROGEN HALIDE IN GASEOUS MOLECULAR FORM FOR A PERIOD BETWEEN ABOUT 1/2 SECOND AND 120 MINUTES, AT A TEMPERATURE BETWEEN ABOUT -80* C. AND 1104*C., A GAS CONCENTRATION BETWEEN ABOUT 30 AND 100 PERCENT BY WEIGHT AND A PRESSURE BETWEEN ABOUT 1 MM. AND 100 CM HG TO CAUSE A SURFACE SORPTION ONLY OF SAID HYDROGEN HALIDE GAS MOLECULES BY THE POLYMERS TO BREAK THE HYDROGEN BONDS BETWEEN THE ADJOINING POLYAMIDE CHAIN IN THE POLYMER SURFACES AND THEN, WHILE SAID HYDROGEN HALIDE GAS MOLECULES ARE SORBED AT THE POLYMER SURFACE, EXPOSING THE HYDROGEN HALIDE TREATED SURFACES TO MOISTURE TO HYDROLYZE THE CARBONYL-AMIDE LINKAGES BETWEEN THE LINKS IN THE POLYAMIDE CHAINS IN THE POLYMER SURFACES.
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) | 1966-01-28 | 1966-07-30 | 1967-01-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-28 | 1970-07-30 | 1971-01-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-28 | 1974-07-30 | 1975-01-29 | $7700.00 | Window Closed / Lapsed |