US3553464A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for detecting the density of developer in an electrostatographic duplicator
Assignee: Ricoh Co Ltd
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Filing: 1968-03-19
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Granted: 1971-01-05
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Expires: 1988-03-19
Abstract
Abstract A device for automatically detecting the density of a developer made of a mixture of iron filings and developing colored powder or toner, that is, strictly speaking, detecting the quantity of the toner per unit volume of iron filings.
Inventors
- 👤 Takeshi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:04
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0822; G03G15/0848; G03G15/0849; G03G15/0855; G03G15/50; G03G15/5033; G03G15/5041
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
20 words
A device as claimed in claim 1 wherein said means for scraping the toner from said tape comprises a plate.
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) | 1974-01-04 | 1974-07-06 | 1975-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-04 | 1978-07-06 | 1979-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-04 | 1982-07-06 | 1983-01-05 | $7700.00 | Window Closed / Lapsed |