Patent US3521077A successfully refreshed from Google Patents.
US3521077A
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Electrical distribution system
Assignee: HARSCH Corp (HARSCO)
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Filing: 1969-05-08
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Granted: 1970-07-21
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Expires: 1989-05-08
Abstract
No abstract record available.
Inventors
- 👤 Charles W Buenzli Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:08
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/02; H02H3/033; G; G01; G01R; G01R21/00; G01R21/133; G01R21/1333; G01R21/1335; G06; G06F; G06F7/00; G06F7/02; G06F7/026; H02J; H02J3/00; H02J3/12; H02J3/14; H02J2105/00; H02J2105/50; H02J2105/57; Y; Y02; Y02B; Y02B70/00; Y02B70/30; Y02B70/3225; Y04; Y04S; Y04S20/00; Y04S20/20; Y04S20/222
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-20 | 1974-01-19 | 1974-07-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-20 | 1978-01-19 | 1978-07-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-20 | 1982-01-19 | 1982-07-21 | $7700.00 | Window Closed / Lapsed |