Patent US3746834A successfully refreshed from Google Patents.
US3746834A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for fixing electrographic power images
Assignee: US Philips Corp
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Filing: 1972-01-04
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Granted: 1973-07-17
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Expires: 1992-01-04
Abstract
Abstract The invention relates to a device for thermal fixation of electrographic powder images on carriers of arbitrary quality and thickness. The device comprises a thermal radiator having a mechanical radiation shutter in the form of a rotatable cylindrical reflector provided with a bar-shaped radiator in the focal point for selective radiation of given areas of the carrier.
Inventors
- 👤 H Purps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:28
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
124 words
A device for thermal fixation of electrographic powder images on carriers of arbitrary quality and thickness comprising a thermal radiator for radiating the carrier passing in proximity thereto, said thermal radiator having a mechanical radiation shutter for the selective radiation of given areas of said carrier, such as line by line, said radiation shutter being constructed in the form of a cylindrical reflector, said reflector being pivotable about a longitudinal axis thereof, and having a radiator substantially in a focal point, and means for controlling the radiation of desired areas on the carrier for a given period of time, said radiation control means further comprising means for rotating said reflector about the longitudinal axis in synchronization with passage of said carrier past said reflector.
Claim 2
Independent Claim
124 words
A device for thermal fixation of electrographic powder images on carriers of arbitrary quality and thickness comprising a thermal radiator for radiating the carrier passing in proximity thereto, said thermal radiator having a mechanical radiation shutter for the selective radiation of given areas of said carrier, such as line by line, said radiation shutter being constructed in the form of a cylindrical reflector, said reflector being pivotable about a longitudinal axis thereof, and having a radiator substantially in a focal point, and means for controlling the radiation of desired areas on the carrier for a given period of time, said radiation control means further comprising means for rotating said reflector about the longitudinal axis in synchronization with passage of said carrier past said reflector.
Claim 3
Dependent Claim
16 words
A device as claimed in claim 1, wherein the cylindrical reflector has a circular inner section.
Claim 4
Dependent Claim
25 words
A device as claimed in claim 1, wherein the cylindrical reflector has an outer cylindrical construction and a parabolic reflective section on the inside thereof.
Claim 5
Dependent Claim
19 words
A device as claimed in claim 1, wherein a fan is provided for cooling and for discharging the vapours.
Claim 6
Dependent Claim
15 words
A device as claimed in claim 1, wherein the inside of the reflector is mirrored.
Claim 7
Dependent Claim
29 words
A device as claimed in claim 1, wherein a single rotation of the reflector through 360* which is required for a fixation process, is controlled by a single-revolution coupling.
Claim 8
Dependent Claim
19 words
A device as claimed in claim 1, wherein a reflector is provided opposite the radiated area of said carrier.
Claim 9
Dependent Claim
29 words
A device as claimed in claim 1, wherein a single rotation of the reflector through 360* which is required for a fixation process, is controlled by a coupling-braking system.
Claim 10
Dependent Claim
29 words
A device as claimed in claim 1, wherein a single rotation of the reflector through 360* which is required for a fixation process, is controlled by a stepping motor.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |