Patent US2638660A successfully refreshed from Google Patents.
US2638660A
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US
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Electrical insulator
Assignee: Philips Laboratories Inc
•
Filing: 1945-04-03
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Granted: 1953-05-19
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Expires: 1965-04-03
Abstract
No abstract record available.
Inventors
- 👤 Karel M Van Gessel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:05
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/24; H01J9/30; H01J5/00; H01J5/32; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49124; Y10T29/49155; Y10T29/49227
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2109992A
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US2166830A
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US2174682A
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US2220741A
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US2297488A
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US2334631A
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US2486065A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |