US3674353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Toner concentration control apparatus
Assignee: Eastman Kodak Co
•
Filing: 1971-07-01
•
Granted: 1972-07-04
•
Expires: 1991-07-01
Abstract
Abstract AN APPARATUS AND METHOD FOR SENSING THE QUANTITY OF TONER DEPLETED FROM AN ELECTROGRAPHIC DEVELOPER EACH TIME AN ELECTROSTATIC CHARGE PATTERN IS DEVELOPED AND FOR ACTIVATING A TONER REPLENISHER WHEN THE TONER DEPLETION EXCEEDS A PREDETERMINED VALUE. TONER DEPLETION IS SENSED BY A PAIR OF INDUCTION PLATES ARRANGED ON THE UPSTREAM AND DOWNSTREAM SIDES OF THE DEVELOPING STATION ADJACENT THE PATH ALONG WHICH A CHARGE PATTERN-BEARING ELECTROGRAPHIC RECORDING ELEMENT TRAVELS. THE DIFFERENCE IN CHARGE INDUCED ON SUCH PLATES BY THE PASSAGE OF THE UNDEVELOPED AND DEVELOPED PATTERNS CLOSE BY IS AN ACCURATE MEASURE OF THE QUANTITY OF TONER APPLIED TO THE PATTERNS.
Inventors
- 👤 William Trachtenberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:55
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/0822; G03G15/0848; G03G15/0849; G03G15/0851; G03G15/50; G03G15/5033; G03G15/5041; Y; Y10; Y10S; Y10S222/00; Y10S222/01
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |