US3081737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xerographic apparatus for applying ferromagnetic powder
Assignee: GAF Chemicals Corp
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Filing: 1961-03-01
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Granted: 1963-03-19
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Expires: 1981-03-01
Abstract
No abstract record available.
Inventors
- 👤 Frederick H Frantz
- 👤 Carl A Ackerman
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
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
IN AN APPARATUS FOR APPLYING A FERROMAGNETIC POWDER FOR DEVELOPING OF A LATENT IMAGE ON AN ELECTROSTATICALLY CHARGED SHEET, AN ELONGATED CASING HAVING A BOTTOM PORTION ADPATED TO HOLD FINELY DIVIDED FERROMAGNETIC MATERIAL, MEANS FOR CONTINOUSLY AGITATING SAID MATERIAL, A PIAR OF ADJACENTLY PLACED CYLINDERS IN SAID CASING HAVING DISTRIBUTED ON THE SURFACE THEREON SPACED MAGNETIC CORES ADAPTED TO ATTRACT DISCRETE AMOUNTS OF SAID POWDER AND HEREBY FORMING BRISTLES THEREOF EXTENDING RADIALLY FROM THE SURFACE OF SAID CYLINDERS, A ROTATING DRUM HAVING MEANS FOR SUPPORTING SAID CHARGED SHEET ON THE OUTER PERIPHERY THEREOF, SAID DRUM BEING ARRANGED TANGENTIAL TO BOTH SAID CYLINDERS AND IN CLOSE PROXIMITY THEREOF FOR SAID BRISTLES TO CONTACT THE SURFACE OF SAID SHEET, MEANS FOR SIMULTANEOUSLY ROTATING ONE OF SAID CYLINDRES IN THE DIRECTION OF TRAVEL OF SAID SHEET AND OTHER OF SAID CYLINDRES IN THE OPPOSITE DIRECTION THERETO, AND MEANS ASSOCIATED WITH EACH OF SAID CYLINDERS FOR REMOVING THE POWDER DEPOSIT FROM SAID CYLINDERS IN ALTERNATE SEQUENCE IN ACCORDANCE WITH THE EXTENT OF TRAVEL OF SAID SHEET OVER SAID CYLINDERS.
Claim 2
Dependent Claim
175 words
IN AN APPARATUS FOR APPLYING A FERROMAGNETIC POWDER FOR DEVELOPING OF A LATENT IMAGE ON AN ELECTROSTATICALLY CHARGED SHEET, AN ELONGATED CASING HAVING A BOTTOM PORTION ADPATED TO HOLD FINELY DIVIDED FERROMAGNETIC MATERIAL, MEANS FOR CONTINOUSLY AGITATING SAID MATERIAL, A PIAR OF ADJACENTLY PLACED CYLINDERS IN SAID CASING HAVING DISTRIBUTED ON THE SURFACE THEREON SPACED MAGNETIC CORES ADAPTED TO ATTRACT DISCRETE AMOUNTS OF SAID POWDER AND HEREBY FORMING BRISTLES THEREOF EXTENDING RADIALLY FROM THE SURFACE OF SAID CYLINDERS, A ROTATING DRUM HAVING MEANS FOR SUPPORTING SAID CHARGED SHEET ON THE OUTER PERIPHERY THEREOF, SAID DRUM BEING ARRANGED TANGENTIAL TO BOTH SAID CYLINDERS AND IN CLOSE PROXIMITY THEREOF FOR SAID BRISTLES TO CONTACT THE SURFACE OF SAID SHEET, MEANS FOR SIMULTANEOUSLY ROTATING ONE OF SAID CYLINDRES IN THE DIRECTION OF TRAVEL OF SAID SHEET AND OTHER OF SAID CYLINDRES IN THE OPPOSITE DIRECTION THERETO, AND MEANS ASSOCIATED WITH EACH OF SAID CYLINDERS FOR REMOVING THE POWDER DEPOSIT FROM SAID CYLINDERS IN ALTERNATE SEQUENCE IN ACCORDANCE WITH THE EXTENT OF TRAVEL OF SAID SHEET OVER SAID CYLINDERS.
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) | 1966-03-18 | 1966-09-17 | 1967-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-03-18 | 1970-09-17 | 1971-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-03-18 | 1974-09-17 | 1975-03-19 | $7700.00 | Window Closed / Lapsed |