US3860436A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant current biasing transfer system
Assignee: Individual
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Filing: 1973-06-11
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Granted: 1975-01-14
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Expires: 1993-06-11
Abstract
Abstract Electrostatic transfer of charged particles to a transfer member is accomplished using a roller electrode having electrically relaxable and self-leveling layers. The roller, along with the original support for the particles, defines a nip through which the transfer member is passed. Asymmetrical fields associated with the roller permit desirable post-nip air ionization while suppressing undesired pre-nip ionization. Constant current regulation of the roller current automatically corrects for electrical parameter variations affecting the desired field levels, such as variations in the thickness of the transfer member and variations in the resistance of the roller with relative humidity.
Inventors
- 👤 Thomas Meagher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:00
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/14; G03G15/16; G03G15/1665; G03G15/167; G03G15/1675
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
130 words
A TRANSFER METHOD FOR TRANSFERRING AN IMAGE OF ELECTRICALLY CHARGED PARTICLES FROM AN ORIGINAL SUPPORT TO A TRANSFER MEMBER WITH AN ELECTRICALLY RELAXABLE TRANSFER ELECTRODE COMPRISING: ROTATING SAID TRANSFER ELECTRODE, ESTABLISHING A NIP BETWEEN SAID TRANSFER ELECTRODE AND SAID ORIGINAL SUPPORT, PASSING SAID TRANSFER MEMBER THROUGH SAID NIP FROM A PRENIP SIDE OF SAID NIP THROUGH A POST-NIP SIDE OF SAID NIP, APPLYING AN ELECTRICAL BIAS TO SAID TRANSFER ELECTRODE, FORMING WITH SAID ELECTRICAL BIAS AND SAID TRANSFER ELECTRODE ELECTRICAL FIELDS WHICH ARE ASYMMETRICAL BETWEEN SAID PRE-NIP AND POST-NIP SIDES OF SAID NIP AND WHICH HAVE POST-NIP ELECTRICAL FIELDS SUBSTANTIALLY ABOVE AIR IONIZATION LEVELS AND PRE-NIP ELECTRICAL FIELDS BELOW SUBSTANTIAL AIR IONIZATION LEVELS, AND AUTOMATICALLY VARYING SAID ELECTRICAL BIAS APPLIED TO SAID TRANSFER ELECTRODE TO MAINTAIN SAID PRE-NIP AND POST-NIP
Claim 2
Dependent Claim
130 words
A TRANSFER METHOD FOR TRANSFERRING AN IMAGE OF ELECTRICALLY CHARGED PARTICLES FROM AN ORIGINAL SUPPORT TO A TRANSFER MEMBER WITH AN ELECTRICALLY RELAXABLE TRANSFER ELECTRODE COMPRISING: ROTATING SAID TRANSFER ELECTRODE, ESTABLISHING A NIP BETWEEN SAID TRANSFER ELECTRODE AND SAID ORIGINAL SUPPORT, PASSING SAID TRANSFER MEMBER THROUGH SAID NIP FROM A PRENIP SIDE OF SAID NIP THROUGH A POST-NIP SIDE OF SAID NIP, APPLYING AN ELECTRICAL BIAS TO SAID TRANSFER ELECTRODE, FORMING WITH SAID ELECTRICAL BIAS AND SAID TRANSFER ELECTRODE ELECTRICAL FIELDS WHICH ARE ASYMMETRICAL BETWEEN SAID PRE-NIP AND POST-NIP SIDES OF SAID NIP AND WHICH HAVE POST-NIP ELECTRICAL FIELDS SUBSTANTIALLY ABOVE AIR IONIZATION LEVELS AND PRE-NIP ELECTRICAL FIELDS BELOW SUBSTANTIAL AIR IONIZATION LEVELS, AND AUTOMATICALLY VARYING SAID ELECTRICAL BIAS APPLIED TO SAID TRANSFER ELECTRODE TO MAINTAIN SAID PRE-NIP AND POST-NIP
Claim 3
Dependent Claim
33 words
The method of claim 1 further including maintaining a larger air gap between said transfer member and said transfer electrode than between said transfer member and said original support at said post-nip side.
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) | 1978-01-13 | 1978-07-15 | 1979-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-13 | 1982-07-15 | 1983-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-13 | 1986-07-15 | 1987-01-14 | $7700.00 | Window Closed / Lapsed |