US3877018A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Shift register display for light pen
Assignee: Mitsui Engineering and Shipbuilding Co Ltd
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Filing: 1974-02-21
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Granted: 1975-04-08
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Expires: 1994-02-21
Abstract
Abstract The display apparatus comprises a plurality of keys in the form of electric lamps, a shift register adapted to sequentially and cyclically light the electric lamps, and a light pen. The light pen is used to receive a light from a lighted lamp for stopping the shifting operation of the shift register thereby designating the key including said lighted lamp.
Inventors
- 👤 Hiroshi Hakozaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:13
CPC Classifications
G; G06; G06F; G06F3/00; G06F3/01; G06F3/03; G06F3/033; G06F3/038; G06F3/0386
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
56 words
Display apparatus comprising a plurality of keys constituted by a plurality of electric lamps, a shift register adapted to sequentially and cyclically light said electric lamps, and a light pen utilized to receive the light from a lighted lamp for stopping the shifting operation of said shift register thereby designating the key including said lighted lamp.
Claim 2
Dependent Claim
56 words
Display apparatus comprising a plurality of keys constituted by a plurality of electric lamps, a shift register adapted to sequentially and cyclically light said electric lamps, and a light pen utilized to receive the light from a lighted lamp for stopping the shifting operation of said shift register thereby designating the key including said lighted lamp.
Claim 3
Dependent Claim
80 words
The display apparatus according to claim 1 which further comprises a pulse generator for supplying a shift clock pulse to said shift register, a first flip-flop circuit responsive to a function key enabling signal and a clock pulse, a second flip-flop circuit responsive to the output from said first flip-flop circuit and a light pen switch ON signal, and a first AND gate circuit responsive to the outputs of said first and second flip-flop circuits for operating said pulse generator.
Claim 4
Dependent Claim
70 words
The display apparatus according to claim 2 which further comprises a second AND gate circuit, one input thereof being connected to receive the output of said light pen and the other input to the output of said first AND gate circuit through an inverter, and means responsive to the output from said second AND gate circuit for resetting said second flip-flop circuit thereby stopping the operation of said pulse generator.
Claim 5
Dependent Claim
37 words
The display device according to claim 1 which further comprises a third flip-flop circuit which is connected between the least significant digit and the most significant digit of said shift register thus causing it to operate cyclically.
References Cited (Backward Citations)
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US3761620A
Cited
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Cited
US3828128A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-04-07 | 1978-10-07 | 1979-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-04-07 | 1982-10-07 | 1983-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-04-07 | 1986-10-07 | 1987-04-08 | $7700.00 | Window Closed / Lapsed |