Patent US4090108A successfully refreshed from Google Patents.
US4090108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interface system to control flash lamp
Assignee: Xerox Corp
•
Filing: 1976-07-26
•
Granted: 1978-05-16
•
Expires: 1996-07-26
Abstract
Abstract An interface for controlling the energy to a flash lamp based on document information. An area coverage sensing device senses the density of document information advanced along a predetermined path and produces electrical signals thereof. A circuit conditions the signals and transmits them to an energy storage for driving the flash lamp.
Inventors
- 👤 Richard Calvin Johnson
- 👤 Ihor Kulbida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:38
CPC Classifications
G; G03; G03G; G03G15/00; G03G15/20; G03G15/2003; G03G15/2007; G03G15/201
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
88 words
A method of controlling the energy to a flash lamp in response to toner image density on copy sheets comprising the steps of optically sensing the density of toner images on copy sheets advanced along a path, converting the optically sensed information into electrical signals proportional thereto, and transmitting the signals to uni-directional switching means coupled to a variable energy storage device to control the input to said energy storage device for driving the flash lamp in response to the density of toner images on said copy sheets.
Claim 2
Independent Claim
88 words
A method of controlling the energy to a flash lamp in response to toner image density on copy sheets comprising the steps of optically sensing the density of toner images on copy sheets advanced along a path, converting the optically sensed information into electrical signals proportional thereto, and transmitting the signals to uni-directional switching means coupled to a variable energy storage device to control the input to said energy storage device for driving the flash lamp in response to the density of toner images on said copy sheets.
Claim 3
Dependent Claim
46 words
A method according to claim 1 wherein the signals received in the switching means coupled to said variable energy storage device are compared to the voltage across the flash lamp and output signals generated to control said voltage by turning said switching means on and off.
References Cited (Backward Citations)
US3611159A
Cited
US3947117A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |