US3560359A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Corrosion protection
Assignee: RICHARD L HOOD
•
Filing: 1969-05-05
•
Granted: 1971-02-02
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Expires: 1989-05-05
Abstract
Abstract A SOURCE OF FREE ELECTRONS, SUCH AS IS SUPPLIED BY THE GRID OF A CONDUCTING VACUUM TUBE, IS CONNECTED BY A SINGLE ELECTRICAL CONDUCTOR TO A METALLIC STRUCTURE TO BE PROTECTED FROM CORROSION. NO RETURN PATH FOR ELECTRONS FROM THE METALLIC STRUCTURE TO THE SOURCE IS PROVIDED AND IT IS NOT REQUIRED THAT THE PROTECTED STRUCTURE BE EARTH GROUNDED.
Inventors
- 👤 Richard L Hood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:17
CPC Classifications
C; C23; C23F; C23F13/00; C23F13/02; C23F13/04
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) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |