US2638660A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical insulator
Assignee: Philips Laboratories Inc
•
Filing: 1945-04-03
•
Granted: 1953-05-19
•
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
2026-10-27 03:18
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
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2023264A
Cited
US1407776A
Cited
US1592326A
Cited
US2120099A
Cited
US2109992A
Cited
US2166830A
Cited
US2174682A
Cited
US2220741A
Cited
US2297488A
Cited
US2334631A
Cited
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 |