US2278592A
Expired / Lapsed
US
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Contact element
Assignee: Stackpole Carbon Co
•
Filing: 1940-04-23
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Granted: 1942-04-07
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Expires: 1960-04-23
Abstract
No abstract record available.
Inventors
- 👤 Vernon H Sanders
- 👤 Norbert J Schaberl
- 👤 Erle I Shobert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:51
CPC Classifications
H; H01; H01H; H01H1/00; H01H1/02; H01H1/021; H01H1/023; H01H1/0231; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49117; Y10T29/49204; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12139
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1945-04-06 | 1945-10-06 | 1946-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-04-06 | 1949-10-06 | 1950-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-04-06 | 1953-10-06 | 1954-04-07 | $7700.00 | Window Closed / Lapsed |