US4023052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Touch control arrangement
Assignee: US Philips Corp
•
Filing: 1974-09-09
•
Granted: 1977-05-10
•
Expires: 1994-09-09
Abstract
Abstract A great limitation of the tolerance in the touch sensitivity is obtained by a special touch control arrangement.
Inventors
- 👤 Klaus Kroner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:26
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/02; H03J5/0218; H03K; H03K17/00; H03K17/94; H03K17/96; H03K17/9645
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
41 words
A touch control circuit arrangement comprising a touch contact having two electrodes, an amplifier having an input coupled to one of said electrodes, a constant current source coupled to said one electrode, and a voltage source coupled to the remaining electrode.
Claim 2
Dependent Claim
41 words
A touch control circuit arrangement comprising a touch contact having two electrodes, an amplifier having an input coupled to one of said electrodes, a constant current source coupled to said one electrode, and a voltage source coupled to the remaining electrode.
Claim 3
Dependent Claim
31 words
A touch circuit as claimed in claim 1 wherein said current source comprises a transistor having a collector coupled to said one electrode and an emitter means for receiving a voltage.
Claim 4
Dependent Claim
80 words
A touch circuit as claimed in claim 2 comprising a plurality of touch contacts each having two electrodes, a plurality of amplifiers each having an input coupled to one of said electrodes respectively, a plurality of current sources coupled to said one electrodes respectively, said plurality of current sources comprising said transistor, said transistor having a plurality of collector electrodes, and a diode means for preventing overdrive upon a large contact resistance coupled between said collectors and a voltage source.
Claim 5
Dependent Claim
42 words
A touch contact surface as claimed in claim 1 wherein said amplifier comprises an output, and further comprising feedback means coupled between said output and said current source for reducing the current supplied by said source upon touching of said touch contact.
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) | 1980-05-09 | 1980-11-08 | 1981-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-09 | 1984-11-08 | 1985-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-09 | 1988-11-08 | 1989-05-10 | $7700.00 | Window Closed / Lapsed |