US2558728A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermostable polymeric vinylidene chloride composition
Assignee: Dow Chemical Co
•
Filing: 1949-04-25
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Granted: 1951-07-03
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Expires: 1969-04-25
Abstract
No abstract record available.
Inventors
- 👤 Edgar C Britton
- 👤 Fevre Walter J Le
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:58
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/17; C08K5/175
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
82 words
A COMPOSITION OF MATTER COMPRISING A POLYMERIC VINYLIDENE CHLORIDE PRODUCT WHICH TENDS TO DARKEN WHEN HEATED, AND, AS A HEAT STABILIZING AGENT THEREFOR, FROM 0.5 TO 5 PER CENT BY WEIGHT OF A SALT OF ETHYLENE DIAMINE N,N''-TETRA-ACETIC ACID WHEREIN AT LEAST TWO OF THE HYDROGEN IONS OF SAID ACID ARE REPLACED BY TWO IDENTICAL ALKALI METAL IONS AND THE OTHER HYDROGEN IONS ARE REPLACED BY IONS SELECTED FROM THE CLASS CONSISTING OF AN ALKALINE EARTH METAL ION AND ALKALI METAL IONS.
References Cited (Backward Citations)
US2407645A
Cited
US2413856A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-07-02 | 1955-01-01 | 1955-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-02 | 1959-01-01 | 1959-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-02 | 1963-01-01 | 1963-07-03 | $7700.00 | Window Closed / Lapsed |