Patent US2439290A successfully refreshed from Google Patents.
US2439290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composition for igniter for rectifiers
Assignee: Saint Gobain Abrasives Inc
•
Filing: 1946-01-17
•
Granted: 1948-04-06
•
Expires: 1966-01-17
Abstract
No abstract record available.
Inventors
- 👤 Guy H Fetterley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:02
CPC Classifications
H; H01; H01J; H01J13/00; H01J13/02; H01J13/34; H01J13/36; H01J13/38
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB190923351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-06 | 1951-10-06 | 1952-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-06 | 1955-10-06 | 1956-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-06 | 1959-10-06 | 1960-04-06 | $7700.00 | Window Closed / Lapsed |