US1872304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copper hemisulphide rectifier
Assignee: Westinghouse Electric Corp
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Filing: 1927-03-02
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Granted: 1932-08-16
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Expires: 1947-03-02
Abstract
No abstract record available.
Inventors
- 👤 Samuel B Kraut
- 👤 Charles E Margerum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:31
CPC Classifications
H; H10; H10W; H10W72/00; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; H10D; H10D99/00
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) | 1935-08-16 | 1936-02-15 | 1936-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-08-16 | 1940-02-15 | 1940-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-08-16 | 1944-02-15 | 1944-08-16 | $7700.00 | Window Closed / Lapsed |