US4228516A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Computer for metric conversion
Assignee: Individual
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Filing: 1978-12-26
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Granted: 1980-10-14
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Expires: 1998-12-26
Abstract
Abstract A computer adapted for metric conversions from the English system of measurement to metric, and reciprocally back to English from metric, comprising a control panel with dual window to give a simultaneous visual reading of the input and output factors, with control units to switch the conversion control system to one of a series of metric conversion media; said computer having an electronic system with conversion means from English units to metric units, and conversely metric units to English units in each of several physical measurement classifications.
Inventors
- 👤 Harry L. Johnston, Sr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:36
CPC Classifications
G; G06; G06F; G06F15/00; G06F15/02; G06F15/025; G06F15/0258
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A metric conversion computational system comprising: (a) a control unit with a face (b) a plurality of control switches to impress input data into the computer; said control switches being located in the face of the control unit; (c) switch means to switch electrical circuitry from arithmetic to metric conversion system; said switch means being located on the face of the control unit; (d) a control switch on said control unit for changing the metric conversion computational system from one type of conversion media to another; (e) analog electrical means connected to said control switch, said analog electrical means comprising a rotatable member having discrete resistance values for each conversion area.
Claim 2
Dependent Claim
111 words
A metric conversion computational system comprising: (a) a control unit with a face (b) a plurality of control switches to impress input data into the computer; said control switches being located in the face of the control unit; (c) switch means to switch electrical circuitry from arithmetic to metric conversion system; said switch means being located on the face of the control unit; (d) a control switch on said control unit for changing the metric conversion computational system from one type of conversion media to another; (e) analog electrical means connected to said control switch, said analog electrical means comprising a rotatable member having discrete resistance values for each conversion area.
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) | 1983-10-14 | 1984-04-14 | 1984-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-14 | 1988-04-14 | 1988-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-14 | 1992-04-14 | 1992-10-14 | $7700.00 | Window Closed / Lapsed |