Thanks William
and Thanks Gus (for the email)!
It seems if you search for "Keeper" instead of "Keepered", you will find the correct patents and they are the same ones Gus pointed out to me i.e. US Patents Nos.5,041,922; 5,039,655 and 4,985,795. I ordered the full text versions and I will share anything that I think is worth while.
I am rather new to this thread and did not read as far back as post#467, I loved reading thru some of the old posts, I am trying to order that October issue of Data Storage magazine, I think it will be more readable than the Patents. If anybody has it already may be you can email it to me or fax it to me?
Anybody else that is new to this thread here are the Patent abstracts -
Patent No: 5,041,922
Abstract: Magnetic record media are described that have an overlying or underlying magnetically saturable high permeability keeper layer in addition to a high coervicity magnetic layer in which magnetic signals are stored. These media are used in magnetic signal processing devices whose transducers are capable of generating a keeper layer-saturating bias flux. In signal reproduction the bias flux magnetically forms a saturation zone in the nature of virtual gap in the keeper layer that directs signal flux between the media and the transducer.
Patent No: 5,039,655
Abstract: A thin film magnetic array memory affords relatively high packing densities while avoiding the problem of magnetic domain creep through the use of thin films of superconducting material disposed on the work lines of the memory. The superconducting films shunt magnetic fields generated by currents carried within the word lines and prevent these fields from adversely affecting adjacent memory cells in the array. By constraining the magnetic fields with the use of the superconducting films, the word lines can be packed close to one another in the array structure, thereby increasing the amount of information that can be stored in a unit area of the array.
Patent No: 4,985,795
Abstract: Magnetic transducer-keeper combination embodiments of the invention are described. Each has a magnetic core defining a physical gap and a thin magnetic keeper arranged in close proximity of the core to bridge the gap. A magnetic flux from the gap saturates the keeper in an area bridging the gap, thereby forming a signal transducing zone in the keeper. The keeper is maintained stationary and the core moved or scanned with respect to the same, thereby moving or scanning the transducing zone in the keeper.
DN |
