Patent US3022272A successfully refreshed from Google Patents.
US3572288A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Development apparatus
Assignee: Xerox Corp
•
Filing: 1968-08-07
•
Granted: 1971-03-23
•
Expires: 1988-08-07
Abstract
Abstract APPARATUS TO CONTROL THE STOPPING AND STARTING FUNCTION OF A MAGNETIC BRUSH DEVELOPING SYSTEM IN WHICH THE MAGNETIC BRUSH IS RAPIDLY BROUGHT IN AND OUT OF OPERATIVE CONTACT WITH AN IMAGE BEARING PHOTOCONDUCTIVE SURFACE.
Inventors
- 👤 Lyman H Turner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:59
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09
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) | 1974-03-22 | 1974-09-21 | 1975-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-22 | 1978-09-21 | 1979-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-22 | 1982-09-21 | 1983-03-23 | $7700.00 | Window Closed / Lapsed |