Patent US961669A successfully refreshed from Google Patents.
Patent US3209249A successfully refreshed from Google Patents.
US3209249A
Expired / Lapsed
US
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Method of indicating thermal stability of bulk polymers
Assignee: Individual
•
Filing: 1961-10-26
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Granted: 1965-09-28
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Expires: 1981-10-26
Abstract
No abstract record available.
Inventors
- 👤 Robert W Warfield
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:24
CPC Classifications
G; G01; G01N; G01N25/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
THE METHOD OF INDICATING THE THERMAL STABILITY OF A BULK POLYMER WHICH INCLUDES THE STEPS OF PLACING A SAMPLE OF UNPOLYMERIZED RESIN IN HEATING MEANS AND POLYMERIZING SAID SAMPLE, REMOVING SAID SAMPLE FROM SAID HEATING MEANS AND ALLOWING SAID SAMPLE TO COOL AT AMBIENT TEMPERATURE, SAID SAMPLE HAVING TEMPERATURE INDICATING MEANS PARTIALLY INTERNALLY DISPOSED FOR INDICATING THE TEMPERATURE OF SAID SAMPLE AND RESISTIVITY INDICATING MEANS PARTIALLY INTERNALLY DISPOSED FOR INDICATING THE RESISTIVITY OF SAID SAMPLE, MEASURING THE TEMPERATURE AND THE RESISTIVITY OF THE SAMPLE, SIMULTANEOUSLY AT PREDETERMINED PERIODS OF TIME AND TAKING THE LOGARITHM OF THE RESISTIVITY VALUES, REPEATING THE HEATING AND COOLING CYCLE, SAID HEATING CYCLE BEING AT SUCCESSIVELY AND PROGRESSIVELY HIGHER TEMPERATURES UNTIL THE SAMPLE DECOMPOSES, PLOTTING THE LOGARITHM OF THE ELECTRICAL VOLUME RESISTIVITY OF THE SAMPLE DURING EACH SUCCESSIVE COOLING CYCLE AT PREDETERMINED INTERVALS OF TIME, PLOTTING THE LOGARITHM OF THE RESISTIVITY AGAINST TIME AND TEMPERATURES, AND CONNECTING THE PLOTTED POINTS WHEREBY A PLOT IS OBTAINED WHICH INDICATES THE TEMPERATURE OF THERMAL STABILITY AND SUBSEQUENT DEGRADATION OF SAID BULK POLYMER.
Claim 2
Independent Claim
173 words
THE METHOD OF INDICATING THE THERMAL STABILITY OF A BULK POLYMER WHICH INCLUDES THE STEPS OF PLACING A SAMPLE OF UNPOLYMERIZED RESIN IN HEATING MEANS AND POLYMERIZING SAID SAMPLE, REMOVING SAID SAMPLE FROM SAID HEATING MEANS AND ALLOWING SAID SAMPLE TO COOL AT AMBIENT TEMPERATURE, SAID SAMPLE HAVING TEMPERATURE INDICATING MEANS PARTIALLY INTERNALLY DISPOSED FOR INDICATING THE TEMPERATURE OF SAID SAMPLE AND RESISTIVITY INDICATING MEANS PARTIALLY INTERNALLY DISPOSED FOR INDICATING THE RESISTIVITY OF SAID SAMPLE, MEASURING THE TEMPERATURE AND THE RESISTIVITY OF THE SAMPLE, SIMULTANEOUSLY AT PREDETERMINED PERIODS OF TIME AND TAKING THE LOGARITHM OF THE RESISTIVITY VALUES, REPEATING THE HEATING AND COOLING CYCLE, SAID HEATING CYCLE BEING AT SUCCESSIVELY AND PROGRESSIVELY HIGHER TEMPERATURES UNTIL THE SAMPLE DECOMPOSES, PLOTTING THE LOGARITHM OF THE ELECTRICAL VOLUME RESISTIVITY OF THE SAMPLE DURING EACH SUCCESSIVE COOLING CYCLE AT PREDETERMINED INTERVALS OF TIME, PLOTTING THE LOGARITHM OF THE RESISTIVITY AGAINST TIME AND TEMPERATURES, AND CONNECTING THE PLOTTED POINTS WHEREBY A PLOT IS OBTAINED WHICH INDICATES THE TEMPERATURE OF THERMAL STABILITY AND SUBSEQUENT DEGRADATION OF SAID BULK POLYMER.
References Cited (Backward Citations)
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US1987244A
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US2650343A
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US2638529A
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US2993769A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |