Patent FR1216718A successfully refreshed from Google Patents.
Patent US2638416A successfully refreshed from Google Patents.
US2638416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Developer composition for developing an electrostatic latent image
Assignee: Battelle Development Corp
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Filing: 1948-05-01
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Granted: 1953-05-12
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Expires: 1968-05-01
Abstract
No abstract record available.
Inventors
- 👤 Lewis E Walkup
- 👤 Edward N Wise
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:02
CPC Classifications
G; G03; G03G; G03G13/00; G03G13/06; G03G13/08; G03G13/22; G03G9/00; G03G9/08; G03G9/10; Y; Y10; Y10S; Y10S101/00; Y10S101/37
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A DEVELOPER COMPOSITION FOR DEVELOPING AN ELECTROSTATIC LATENT IMAGE OF SUBSTANTIALLY HOMOGENEOUS POLARITY COMPRISING RELATIVELY LARGER SUBSTANTIALLY EQUIDIMENSIONAL CARRIER PARTICLES AND GROSSLY SMALLER COLORED RESIN POWDER PARTICLES LOOSELY MOVABLE AND ELECTROSTATICALLY COATED THEREON, THE POWDER PARTICLES BEING OF A SIZE IN THE ORDER OF 0.1 TO 20 MICRONS, THE CARRIER PARTICLES BEING OF A SIZE SUCH THAT BY THEIR OWN WEIGHT THEY ARE MOVABLE AWAY FROM OPPOSITELY CHARGED POWDER PARTICLES, THE POWDER PARTICLES AND CARRIER PARTICLES BEING OF OPPOSITE TRIBOELECTRIC CHARACTERISTICS WHEREBY, BY MIXING, THE CARRIER AND POWDER PARTICLES ACQUIRE CHARGES OF OPPOSITE POLARITY, THE POWDER PARTICLES BEING TRIBOELECTRICALLY OPPOSITE, WITH RESPECT TO THE CARRIER PARTICLES, TO THE POLARITY OF THE IMAGE TO BE DEVELOPED AND THE POWDER PARTICLES BY MIXING WITH THE CARRIER PARTICLES ACQUIRING A CHARGE OF POLARITY OPPOSITE TO THE IMAGE, WHEREBY THE POWDER PARTICLES ARE ADAPTED TO BE ELECTROSTATICALLY REMOVED FROM THE CARRIER SURFACES BY AND TO THE CHARGED PORTIONS OF THE ELECTROSTATIC IMAGE AND PREFERENTIALLY ATTRACTED BY AND TO THE CARRIER SURFACES FROM THE BACKGROUND PORTIONS OF THE IMAGE.
Claim 2
Dependent Claim
174 words
A DEVELOPER COMPOSITION FOR DEVELOPING AN ELECTROSTATIC LATENT IMAGE OF SUBSTANTIALLY HOMOGENEOUS POLARITY COMPRISING RELATIVELY LARGER SUBSTANTIALLY EQUIDIMENSIONAL CARRIER PARTICLES AND GROSSLY SMALLER COLORED RESIN POWDER PARTICLES LOOSELY MOVABLE AND ELECTROSTATICALLY COATED THEREON, THE POWDER PARTICLES BEING OF A SIZE IN THE ORDER OF 0.1 TO 20 MICRONS, THE CARRIER PARTICLES BEING OF A SIZE SUCH THAT BY THEIR OWN WEIGHT THEY ARE MOVABLE AWAY FROM OPPOSITELY CHARGED POWDER PARTICLES, THE POWDER PARTICLES AND CARRIER PARTICLES BEING OF OPPOSITE TRIBOELECTRIC CHARACTERISTICS WHEREBY, BY MIXING, THE CARRIER AND POWDER PARTICLES ACQUIRE CHARGES OF OPPOSITE POLARITY, THE POWDER PARTICLES BEING TRIBOELECTRICALLY OPPOSITE, WITH RESPECT TO THE CARRIER PARTICLES, TO THE POLARITY OF THE IMAGE TO BE DEVELOPED AND THE POWDER PARTICLES BY MIXING WITH THE CARRIER PARTICLES ACQUIRING A CHARGE OF POLARITY OPPOSITE TO THE IMAGE, WHEREBY THE POWDER PARTICLES ARE ADAPTED TO BE ELECTROSTATICALLY REMOVED FROM THE CARRIER SURFACES BY AND TO THE CHARGED PORTIONS OF THE ELECTROSTATIC IMAGE AND PREFERENTIALLY ATTRACTED BY AND TO THE CARRIER SURFACES FROM THE BACKGROUND PORTIONS OF THE IMAGE.
References Cited (Backward Citations)
US1818760A
Cited
US2192241A
Cited
US2221776A
Cited
US2297691A
Cited
US2357809A
Cited
US2345941A
Cited
US2463927A
Cited
US2488560A
Cited
US2484782A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-11 | 1956-11-10 | 1957-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-11 | 1960-11-10 | 1961-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-11 | 1964-11-10 | 1965-05-12 | $7700.00 | Window Closed / Lapsed |