Patent US3405052A successfully refreshed from Google Patents.
US3405052A
Expired / Lapsed
US
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Apparatus for corona treatment of film including a porous sintered metal electrode
Assignee: WR Grace and Co
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Filing: 1967-07-12
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Granted: 1968-10-08
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Expires: 1987-07-12
Abstract
No abstract record available.
Inventors
- 👤 Henry G Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:22
CPC Classifications
H; H01; H01T; H01T19/00; B; B26; B26F; B26F1/00; B26F1/26; B26F1/28; B29; B29C; B29C59/00; B29C59/10; H01T14/00; Y; Y10; Y10S; Y10S422/00; Y10S422/907
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3294971A
Cited
US3284331A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-08 | 1972-04-08 | 1972-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-08 | 1976-04-08 | 1976-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-08 | 1980-04-08 | 1980-10-08 | $7700.00 | Window Closed / Lapsed |