US4311996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hand held type electronic calculators
Assignee: Noritake Itron Corp
•
Filing: 1976-02-26
•
Granted: 1982-01-19
•
Expires: 1996-02-26
Abstract
Abstract In a hand held type electronic calculator wherein a display section and a key board are mounted on the surface of an insulative substrate, a driving circuit for driving the display section and an operation circuit operated by the key board are also mounted on the same surface of the insulative substrate.
Inventors
- 👤 Tadashi Nakamura
- 👤 Kentaro Kiyozumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:39
CPC Classifications
G; G06; G06F; G06F15/00; G06F15/02; G06F15/0225
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
92 words
A unitary type electronic calculator comprising a multi-digit display section and a key board mounted on one surface of an insulative substrate, a driving circuit for said display section and an operation circuit operated by said key board mounted on said surface of said insulative substrate and printed wire means on only said one surface of said substrate for operatively interconnecting the elements mounted on said surface to operate as a calculator having a physical thickness no greater than the combined thickness of said substrate and the thickest one of said elements.
Claim 2
Dependent Claim
92 words
A unitary type electronic calculator comprising a multi-digit display section and a key board mounted on one surface of an insulative substrate, a driving circuit for said display section and an operation circuit operated by said key board mounted on said surface of said insulative substrate and printed wire means on only said one surface of said substrate for operatively interconnecting the elements mounted on said surface to operate as a calculator having a physical thickness no greater than the combined thickness of said substrate and the thickest one of said elements.
Claim 3
Dependent Claim
50 words
A calculator accordingly to claim 1 in which said substrate is a material which transmits visible light and said display section is a liquid crystal display formed as a transparent overlay on one end of said substrate so that said display section receives transmitted visible light passing through said substrate.
Claim 4
Dependent Claim
22 words
The calculator of claim 2 wherein said transparent overlay is the viewing surface for observing the digits of said liquid crystal display.
Claim 5
Dependent Claim
42 words
The calculator of claim 3 and including a fitted case for receiving said substrate with the elements on said one surface enclosed within said case except for said viewing surface, said case having an aperture located to correspond with said viewing surface.
Claim 6
Dependent Claim
37 words
A calculator according to claim 1 including a fitted case for receiving said substrate with the keys of said keyboard accessible at the top of said case, said substrate forming the bottom surface to close said case.
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) | 1985-01-18 | 1985-07-20 | 1986-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-01-18 | 1989-07-20 | 1990-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-01-18 | 1993-07-20 | 1994-01-19 | $7700.00 | Window Closed / Lapsed |