Patent US4701896A successfully refreshed from Google Patents.
US4701896A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interactive plural head laser disc system
Assignee: Resolution Research Inc
•
Filing: 1984-08-20
•
Granted: 1987-10-20
•
Expires: 2004-08-20
Abstract
Abstract An interactive plural head laser disc system is disclosed characterized by use of plural pairs of heads installed on both sides of one or more laser discs which heads may be accessed by either multi or single users to independently and/or simultaneously access a single disc or plurality of discs. The plural heads are disposed inside a housing having a plurality of slots therein, each slot being configured to receive and permit mounting of a laser disc therein.
Inventors
- 👤 Edward F. Allebest
- 👤 Parley E. Hansen
- 👤 George A. Walsh
- 👤 Walter R. Maguire
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:06
CPC Classifications
G; G11; G11B; G11B17/00; G11B17/02; G11B17/022; G11B17/028; G11B17/0287; G11B17/021; G11B17/0282; G11B17/22; G11B17/26; G11B19/00; G11B19/20; G11B25/00; G11B25/04; G11B25/043; G11B27/00; G11B27/10; G11B27/102; G11B27/105; G11B27/19; G11B27/28; G11B27/30; G11B27/3027; G11B27/3036; G11B27/3054; G11B7/00; G11B7/002; G11B7/0037; G11B7/08; G11B2220/00; G11B2220/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
175 words
An optical disc data storage and retrieval system for reading information stored on a plurality of optical discs having a plurality of tracks for storing information, comprising: a disc drive shaft; means for mounting a plurality of discs to the disc drive shaft spaced apart along the length thereof, the disc drive shaft being selectively engageable with the disc such that the discs are rotatable with the disc drive shaft; said drive shaft and mounting means being mounted inside a housing having a plurality of slots therein, each slot being configured to receive a disc; a plurality of read heads positioned proximate each of the discs for reading information stored thereon; means for providing access to each disc in track thereon independently of the other disc and tracks; and support means for supporting the disc in the slots when the disc drive shaft is disengaged from the disc; wherein the disc drive shaft includes means for selectively lifting each disc off the support means and engaging the disc for rotation with the disc drive shaft.
Claim 2
Dependent Claim
175 words
An optical disc data storage and retrieval system for reading information stored on a plurality of optical discs having a plurality of tracks for storing information, comprising: a disc drive shaft; means for mounting a plurality of discs to the disc drive shaft spaced apart along the length thereof, the disc drive shaft being selectively engageable with the disc such that the discs are rotatable with the disc drive shaft; said drive shaft and mounting means being mounted inside a housing having a plurality of slots therein, each slot being configured to receive a disc; a plurality of read heads positioned proximate each of the discs for reading information stored thereon; means for providing access to each disc in track thereon independently of the other disc and tracks; and support means for supporting the disc in the slots when the disc drive shaft is disengaged from the disc; wherein the disc drive shaft includes means for selectively lifting each disc off the support means and engaging the disc for rotation with the disc drive shaft.
Claim 3
Dependent Claim
81 words
The system of claim 1 wherein the engaging means includes: a rod inside the disc drive shaft; a first cam mounted to the rod for each disc location; a second cam mounted to the rod for each disc location; lifting means actuatable by the first cam for lifting each disc off its shelf; and stop means actuatable by the second cam for stopping motion of the discs so that each disc is retained between the lifting means and the stop means.
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) | 1990-10-19 | 1991-04-20 | 1991-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-10-19 | 1995-04-20 | 1995-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-10-19 | 1999-04-20 | 1999-10-20 | $7700.00 | Window Closed / Lapsed |