US2862961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Improving the electrical properties of pentaerythritol esters by treatment with magnesium silicate
Assignee: Hercules Powder Co
•
Filing: 1955-10-13
•
Granted: 1958-12-02
•
Expires: 1975-10-13
Abstract
No abstract record available.
Inventors
- 👤 Theodore N Goreau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:15
CPC Classifications
C; C07; C07C; C07C67/00; C07C67/48; C07C67/56
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
THE PROCESS WHICH COMPRISES CONTACTING A SYNTHETIC TETRAESTER OF PENTAERYTHRITIL AND AN ALKANOIC ACID CONTAINING FROM 4 TO 12 CARBON ATOMS WITH SYNTHETIC HYDROUS MAGNESIUM SILICATE FOR AT LEAST ABOUT ONE MINUTE TO INCREASE THE VOLUME RESISTIVITY OF SAID ESTER.
Claim 2
Dependent Claim
40 words
THE PROCESS WHICH COMPRISES CONTACTING A SYNTHETIC TETRAESTER OF PENTAERYTHRITIL AND AN ALKANOIC ACID CONTAINING FROM 4 TO 12 CARBON ATOMS WITH SYNTHETIC HYDROUS MAGNESIUM SILICATE FOR AT LEAST ABOUT ONE MINUTE TO INCREASE THE VOLUME RESISTIVITY OF SAID ESTER.
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) | 1961-12-01 | 1962-06-02 | 1962-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-12-01 | 1966-06-02 | 1966-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-12-01 | 1970-06-02 | 1970-12-02 | $7700.00 | Window Closed / Lapsed |