US2934683A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure resistant insulators for selenium rectifiers
Assignee: TDK Micronas GmbH
•
Filing: 1957-11-01
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Granted: 1960-04-26
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Expires: 1977-11-01
Abstract
No abstract record available.
Inventors
- 👤 Durst Robert Francis
- 👤 Machala Anthony Edward
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:18
CPC Classifications
H; H10; H10D; H10D99/00; D; D04; D04B; D04B35/00; D04B35/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
32 words
A PRESSURE RESISTANT INSULATOR FOR SELENUIM RECTIFIERS CONSISTING ESSENTIALLY OF A REACTION PRODUCT OF BIS-PHENOL A (4,4''-ISOPROPYLIDENEDIPHENOL) AND EPICHLOROHYDRIN (1CHLORO-2,3-EPOXYPROPANE) AND AN ALIPHATIC AMINE, AND IN INTIMATE MIXTURE THEREWITH AN INORGANIC FILLER.
Claim 2
Dependent Claim
32 words
A PRESSURE RESISTANT INSULATOR FOR SELENUIM RECTIFIERS CONSISTING ESSENTIALLY OF A REACTION PRODUCT OF BIS-PHENOL A (4,4''-ISOPROPYLIDENEDIPHENOL) AND EPICHLOROHYDRIN (1CHLORO-2,3-EPOXYPROPANE) AND AN ALIPHATIC AMINE, AND IN INTIMATE MIXTURE THEREWITH AN INORGANIC FILLER.
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) | 1963-04-26 | 1963-10-26 | 1964-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-26 | 1967-10-26 | 1968-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-26 | 1971-10-26 | 1972-04-26 | $7700.00 | Window Closed / Lapsed |