US3176652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic developing apparatus
Assignee: Xerox Corp
•
Filing: 1961-12-29
•
Granted: 1965-04-06
•
Expires: 1981-12-29
Abstract
No abstract record available.
Inventors
- 👤 George R Mott
- 👤 Harold E Clark
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:37
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/06; G03G15/08; G03G15/09; G03G15/0921
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
APPARATUS FOR DEVELOPING ELECTROSTATIC LATENT IMAGES PREVIOUSLY FORMED ON A SUPPORT MEMBER, THE APPARATUS COMPRISING IN COMBINATION: (A) A STATIONARY MAGNETIC FIELD PRODUCING MEANS OF PREDETERMINED LENGTH, (B) MEANS TO SUPPORT SAID FIELD PRODUCING MEANS, (C) A CYLINDRICAL SHIELD FORMED OF ALTERNATING CIRCUMFERENTIAL SECTIONS OF MAGNETIC AND NONMAGNETIC MATERIAL SUBSTANTIALLY ENCLOSING THE LENGTH OF SAID FIELD PRODUCING MEANS AND SPACED AT LEAST PARTIALLY WITHIN THE EFFECTIVE MAGNETIC FIELD OF SAID PRODUCING MEANS TO PHYSICALLY PREVENT MAGNETIC PARTICLES FROM ATTACHING TO SAID FIELD PRODUCING MEANS, (D) SAID SHIELD HAVING AN EXTERIOR SURFACE PATTERNED TO RETAIN A QUANTITY OF MAGNETIC POWDER DEVELOPER PARTICLES ATTRACTED THERETO BY THE FIELD PRODUCING MEANS ENCLOSED THEREWITHIN AND SU BSTANTIALLY STATIONARY RELATIVE TO SAID SHIELD DURING ROTATION, THE MAGNETIC PARTICLES BEING CAUSED TO FORM A BRUSHLIKE ARRAY ON SAID EXTERIOR SURFACE, (E) A SUPPLY SOURCE OF MAGNETIC POWDER DEVELOPER
Claim 2
Dependent Claim
142 words
APPARATUS FOR DEVELOPING ELECTROSTATIC LATENT IMAGES PREVIOUSLY FORMED ON A SUPPORT MEMBER, THE APPARATUS COMPRISING IN COMBINATION: (A) A STATIONARY MAGNETIC FIELD PRODUCING MEANS OF PREDETERMINED LENGTH, (B) MEANS TO SUPPORT SAID FIELD PRODUCING MEANS, (C) A CYLINDRICAL SHIELD FORMED OF ALTERNATING CIRCUMFERENTIAL SECTIONS OF MAGNETIC AND NONMAGNETIC MATERIAL SUBSTANTIALLY ENCLOSING THE LENGTH OF SAID FIELD PRODUCING MEANS AND SPACED AT LEAST PARTIALLY WITHIN THE EFFECTIVE MAGNETIC FIELD OF SAID PRODUCING MEANS TO PHYSICALLY PREVENT MAGNETIC PARTICLES FROM ATTACHING TO SAID FIELD PRODUCING MEANS, (D) SAID SHIELD HAVING AN EXTERIOR SURFACE PATTERNED TO RETAIN A QUANTITY OF MAGNETIC POWDER DEVELOPER PARTICLES ATTRACTED THERETO BY THE FIELD PRODUCING MEANS ENCLOSED THEREWITHIN AND SU BSTANTIALLY STATIONARY RELATIVE TO SAID SHIELD DURING ROTATION, THE MAGNETIC PARTICLES BEING CAUSED TO FORM A BRUSHLIKE ARRAY ON SAID EXTERIOR SURFACE, (E) A SUPPLY SOURCE OF MAGNETIC POWDER DEVELOPER
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-05 | 1968-10-05 | 1969-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-05 | 1972-10-05 | 1973-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-05 | 1976-10-05 | 1977-04-06 | $7700.00 | Window Closed / Lapsed |