Patent US1978572A successfully refreshed from Google Patents.
US2473751A
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Device for expelling static charges from dielectrical substances
Assignee: Individual
•
Filing: 1948-02-24
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Granted: 1949-06-21
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Expires: 1968-02-24
Abstract
No abstract record available.
Inventors
- 👤 Howard R Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:26
CPC Classifications
H; H05; H05F; H05F3/00; Y; Y10; Y10S; Y10S101/00; Y10S101/37; Y10S271/00; Y10S271/901
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US341788A
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US1731030A
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US1716602A
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US1710706A
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US2094787A
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US2257688A
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US2300923A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-06-20 | 1952-12-20 | 1953-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-20 | 1956-12-20 | 1957-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-20 | 1960-12-20 | 1961-06-21 | $7700.00 | Window Closed / Lapsed |