Patent US3699587A successfully refreshed from Google Patents.
US3699587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
P.p.i. display utilizing magnetic recording apparatus
Assignee: Honeywell Inc
•
Filing: 1971-07-22
•
Granted: 1972-10-17
•
Expires: 1991-07-22
Abstract
Abstract A P.P.I. type display uses a display face having a suspension of magnetically orientable and light reflective particles which are orientable between two incident light reflecting states. A rotating erasing means is used to uniformly orient the particles into the first state while a rotating recording means carrying discrete recording elements is selectively actuated to orient selected ones of the particles into the second state. The erasing means and recording means are mounted on separate arms connected together at one end to a common motor driven shaft located at the center of the display face and perpendicular thereto.
Inventors
- 👤 William E Currie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:25
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/008; G01; G01S; G01S7/00; G01S7/02; G01S7/04
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
129 words
A recording apparatus comprising a display face including a display surface having deposited thereon a suspension of force field responsive, light reflective and flake-like particles; first force field means for preorienting said particles into a first light reflective state; second force field means for orienting said light reflective particles into a second light reflective state; said first and said second force field means being arranged to extend along respective radial lines originating at a common point on said recording surface; means for inducing a relative motion between said recording surface and said first and second force field means; means for continuously energizing said first force field means; and means for selectively energizing said second force field means in response to input signals to be recorded on said recording surface.
Claim 2
Dependent Claim
129 words
A recording apparatus comprising a display face including a display surface having deposited thereon a suspension of force field responsive, light reflective and flake-like particles; first force field means for preorienting said particles into a first light reflective state; second force field means for orienting said light reflective particles into a second light reflective state; said first and said second force field means being arranged to extend along respective radial lines originating at a common point on said recording surface; means for inducing a relative motion between said recording surface and said first and second force field means; means for continuously energizing said first force field means; and means for selectively energizing said second force field means in response to input signals to be recorded on said recording surface.
Claim 3
Dependent Claim
52 words
A recording apparatus as set forth in claim 1 wherein said first and second means are mounted on respective arms connected at one end thereof to a common shaft located at the center of said recording surface and said means for inducing relative motion includes a motor means for driving said shaft.
Claim 4
Dependent Claim
29 words
A recording apparatus as set forth in claim 2 wherein said second means includes a plurality of separately operable force field producing means each capable of orienting said particles.
Claim 5
Dependent Claim
31 words
A recording apparatus as set forth in claim 1 wherein said second means for orienting includes a plurality of separately operable force field producing means each capable of orienting said particles.
Claim 6
Dependent Claim
31 words
A recording apparatus as set forth in claim 4 wherein said particles are magnetic, each of said force field producing means and said first force field means produce separate magnetic fields.
Claim 7
Dependent Claim
48 words
A recording apparatus as set forth in claim 4 wherein said means for selectively energizing includes an analog-to-digital converter means arranged to convert an analog input signal to be recorded into a digital signal signal for energizing a predetermined number of said plurality of force field producing means.
Claim 8
Dependent Claim
55 words
A recording apparatus as set forth in claim 6 wherein said means for inducing relative motion includes tone wheel means arranged to produce output signals representative of said relative motions and including means for applying said output signals to said means for selectively energizing and said second force field means to synchronize the operation thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |