Patent US3532494A successfully refreshed from Google Patents.
US3532494A
Expired / Lapsed
US
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Solid area development in xerography employing an insulating screen in the charging step
Assignee: Individual
•
Filing: 1969-09-08
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Granted: 1970-10-06
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Expires: 1989-09-08
Abstract
No abstract record available.
Inventors
- 👤 Gopal C Bhagat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:40
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/04; G03G15/04027; G03G15/02; G03G15/0291; Y; Y10; Y10S; Y10S430/00; Y10S430/001; Y10S430/102
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2965868A
Cited
US3248216A
Cited
US3281857A
Cited
US3196012A
Cited
US3339469A
Cited
US3152528A
Cited
US3449568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-10-05 | 1974-04-06 | 1974-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-10-05 | 1978-04-06 | 1978-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-10-05 | 1982-04-06 | 1982-10-06 | $7700.00 | Window Closed / Lapsed |