Patent US3515550A successfully refreshed from Google Patents.
US3515550A
Expired / Lapsed
US
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Electrophotographic composition comprising zinc oxide and a metallic naphthenate
Assignee: Ashland LLC
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Filing: 1966-08-29
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Granted: 1970-06-02
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Expires: 1986-08-29
Abstract
No abstract record available.
Inventors
- 👤 Stephen C Heidecker
- 👤 David D Taft
- 👤 Walter A Wallman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:28
CPC Classifications
G; G03; G03G; G03G5/00; G03G5/02; G03G5/04; G03G5/05; G03G5/0503; G03G5/051; G03G5/0517
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2681897A
Cited
US3212890A
Cited
GB888371A
Cited
US3157117A
Cited
US3331687A
Cited
US3417019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-06-01 | 1973-12-01 | 1974-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-06-01 | 1977-12-01 | 1978-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-06-01 | 1981-12-01 | 1982-06-02 | $7700.00 | Window Closed / Lapsed |