US2773746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of evaluating polymerized vinyl chloride systems
Assignee: Armstrong World Industries Inc
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Filing: 1955-07-14
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Granted: 1956-12-11
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Expires: 1975-07-14
Abstract
No abstract record available.
Inventors
- 👤 Harold A Reehling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:56
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/34; C08K5/00; C08K5/0008; C08K5/0041
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
THE METHOD OF TESTING THE STABILITY AGAINST HEAT AND LIGHT DEGRADATION OF A RESINOUS SYSTEM CONTAINING AS AN INGREDIENT THEREOF A POLYMERIZED VINYL CHLORIDE, WHICH METHOD COMPRISES INCORPORATING ULTRAMARINE BLUE IN SAID SYSTEM, EXPOSING THE RESULTING MIXTURE TO DEGRADATION CONDITIONS, AND ESTIMATING THE DEGREE OF STABILITY OF THE SYSTEM BY THE COLOR CHANGE OF THE EXPOSED MIXTURE.
Claim 2
Independent Claim
57 words
THE METHOD OF TESTING THE STABILITY AGAINST HEAT AND LIGHT DEGRADATION OF A RESINOUS SYSTEM CONTAINING AS AN INGREDIENT THEREOF A POLYMERIZED VINYL CHLORIDE, WHICH METHOD COMPRISES INCORPORATING ULTRAMARINE BLUE IN SAID SYSTEM, EXPOSING THE RESULTING MIXTURE TO DEGRADATION CONDITIONS, AND ESTIMATING THE DEGREE OF STABILITY OF THE SYSTEM BY THE COLOR CHANGE OF THE EXPOSED MIXTURE.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-11 | 1960-06-11 | 1960-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-11 | 1964-06-11 | 1964-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-11 | 1968-06-11 | 1968-12-11 | $7700.00 | Window Closed / Lapsed |