Patent US2485458A successfully refreshed from Google Patents.
US2485458A
Expired / Lapsed
US
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Dielectric sheet and method of manufacture
Assignee: Johns Manville Corp
•
Filing: 1944-03-28
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Granted: 1949-10-18
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Expires: 1964-03-28
Abstract
No abstract record available.
Inventors
- 👤 Robert G Quinn
- 👤 Joseph C Harkness
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:18
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/02; H01B3/08; H01B3/084
Claims Analysis
Total Claims: 0
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US1971162A
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US2183811A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-10-17 | 1953-04-18 | 1953-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-10-17 | 1957-04-18 | 1957-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-10-17 | 1961-04-18 | 1961-10-18 | $7700.00 | Window Closed / Lapsed |