US2040919A
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US
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Assignee: Engineering & Res Corp
•
Filing: 1932-04-07
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Granted: 1936-05-19
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Expires: 1952-04-07
Abstract
No abstract record available.
Inventors
- 👤 Samuel P Caldwell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:33
CPC Classifications
H; H01; H01H; H01H13/00; H01H13/02; H01H13/04; H01H13/06; H01H1/00; H01H1/64; H01H11/00; H01H11/0006; H01H11/0018; H01H19/00; H01H19/54; H01H19/60; H01H19/635; H01H9/00; H01H9/20; H01H9/28; H01H9/281
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) | 1939-05-19 | 1939-11-18 | 1940-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-05-19 | 1943-11-18 | 1944-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-05-19 | 1947-11-18 | 1948-05-19 | $7700.00 | Window Closed / Lapsed |