Static information storage and retrieval – Read/write circuit – Data refresh
Reexamination Certificate
2005-06-21
2005-06-21
Dinh, Son T. (Department: 2824)
Static information storage and retrieval
Read/write circuit
Data refresh
C365S203000
Reexamination Certificate
active
06909656
ABSTRACT:
A programmable conductor memory cell is read by a sense amplifier but without rewriting the contents of the memory cell. If the programmable contact memory cell has an access transistor, the access transistor is switched off to decouple the cell from the bit line after a predetermined amount of time. The predetermined amount of time is sufficiently long enough to permit the logical state of the cell to be transferred to the bit line and also sufficiently short to isolate the cell from the bit line before the sense amplifier operates. For programmable contact memory cells which do not utilize an access transistor, an isolation transistor may be placed in the bit line located between and serially connection the portion of the bit line from the sense amplifier to the isolation transistor and the portion of the bit line from the isolation transistor to the memory cell. The isolation transistor, normally conducting, is switched off after the predetermined time past the time the bit line begins to discharge through the programmable contact memory cell, thereby isolating the programmable contact memory cell from the sense amplifier before a sensing operation begins.
REFERENCES:
patent: 3271591 (1966-09-01), Ovshinsky
patent: 3622319 (1971-11-01), Sharp
patent: 3743847 (1973-07-01), Boland
patent: 3961314 (1976-06-01), Klose et al.
patent: 3966317 (1976-06-01), Wacks et al.
patent: 3988720 (1976-10-01), Ovshinsky
patent: 3983542 (1976-11-01), Ovshinsky
patent: 4177474 (1979-12-01), Ovshinsky
patent: 4267261 (1981-05-01), Hallman et al.
patent: 4269935 (1981-05-01), Masters et al.
patent: 4312938 (1982-01-01), Drexler et al.
patent: 4316946 (1982-02-01), Masters et al.
patent: 4320191 (1982-03-01), Yoshikawa et al.
patent: 4405710 (1983-09-01), Balasubramanyam et al.
patent: 4419421 (1983-12-01), Wichelhaus et al.
patent: 4499557 (1985-02-01), Holmberg et al.
patent: 4597162 (1986-07-01), Johnson et al.
patent: 4608296 (1986-08-01), Keem et al.
patent: 4637895 (1987-01-01), Ovshinsky et al.
patent: 4646266 (1987-02-01), Ovshinsky et al.
patent: 4664939 (1987-05-01), Ovshinsky
patent: 4668968 (1987-05-01), Ovshinsky et al.
patent: 4670763 (1987-06-01), Ovshinsky et al.
patent: 4671618 (1987-06-01), Wu et al.
patent: 4673957 (1987-06-01), Ovshinsky et al.
patent: 4678679 (1987-07-01), Ovshinsky
patent: 4696758 (1987-09-01), Ovshinsky et al.
patent: 4698234 (1987-10-01), Ovshinsky et al.
patent: 4710899 (1987-12-01), Young et al.
patent: 4728406 (1988-03-01), Banerjee et al.
patent: 4737379 (1988-04-01), Hudgens et al.
patent: 4766471 (1988-08-01), Ovshinsky et al.
patent: 4769338 (1988-09-01), Ovshinsky et al.
patent: 4775425 (1988-10-01), Guha et al.
patent: 4788594 (1988-11-01), Ovshinsky et al.
patent: 4795657 (1989-01-01), Formigoni et al.
patent: 4800526 (1989-01-01), Lewis
patent: 4809044 (1989-02-01), Pryor et al.
patent: 4818717 (1989-04-01), Johnson et al.
patent: 4843443 (1989-06-01), Ovshinsky et al.
patent: 4845533 (1989-07-01), Pryor et al.
patent: 4847674 (1989-07-01), Sliwa et al.
patent: 4853785 (1989-08-01), Ovshinsky et al.
patent: 4891330 (1990-01-01), Guha et al.
patent: 5128099 (1992-07-01), Strand et al.
patent: 5159661 (1992-10-01), Ovshinsky et al.
patent: 5166758 (1992-11-01), Ovshinsky et al.
patent: 5177567 (1993-01-01), Klersy et al.
patent: 5219788 (1993-06-01), Abernathey et al.
patent: 5238862 (1993-08-01), Blalock et al.
patent: 5272359 (1993-12-01), Nagasubramanian et al.
patent: 5296716 (1994-03-01), Ovshinsky et al.
patent: 5314772 (1994-05-01), Kozicki
patent: 5315131 (1994-05-01), Kishimoto et al.
patent: 5335219 (1994-08-01), Ovshinsky et al.
patent: 5341328 (1994-08-01), Ovshinsky et al.
patent: 5350484 (1994-09-01), Gardner et al.
patent: 5359205 (1994-10-01), Ovshinsky
patent: 5360981 (1994-11-01), Owen et al.
patent: 5406509 (1995-04-01), Ovshinsky et al.
patent: 5414271 (1995-05-01), Ovshinsky et al.
patent: 5500532 (1996-03-01), Kozicki et al.
patent: 5512328 (1996-04-01), Yoshimura et al.
patent: 5512773 (1996-04-01), Wolf et al.
patent: 5534711 (1996-07-01), Ovshinsky et al.
patent: 5534712 (1996-07-01), Ovshinsky et al.
patent: 5536947 (1996-07-01), Klersy et al.
patent: 5543737 (1996-08-01), Ovshinsky
patent: 5591501 (1997-01-01), Ovshinsky et al.
patent: 5596522 (1997-01-01), Ovshinsky et al.
patent: 5687112 (1997-11-01), Ovshinsky
patent: 5694054 (1997-12-01), Ovshinsky et al.
patent: 5714768 (1998-02-01), Ovshinsky et al.
patent: 5726083 (1998-03-01), Takaishi
patent: 5751012 (1998-05-01), Wolstenholme et al.
patent: 5761115 (1998-06-01), Kozicki et al.
patent: 5789277 (1998-08-01), Zahorik et al.
patent: 5825046 (1998-10-01), Czubatyj et al.
patent: 5841150 (1998-11-01), Gonzalez et al.
patent: 5846889 (1998-12-01), Harbison et al.
patent: 5883827 (1999-03-01), Morgan
patent: 5896312 (1999-04-01), Kozicki et al.
patent: 5912839 (1999-06-01), Ovshinsky et al.
patent: 5914893 (1999-06-01), Kozicki et al.
patent: 5920788 (1999-07-01), Reinberg
patent: 5933365 (1999-08-01), Klersy et al.
patent: 5998066 (1999-12-01), Block et al.
patent: 6005818 (1999-12-01), Ferrant
patent: 6011757 (2000-01-01), Ovshinsky
patent: 6034909 (2000-03-01), Brady
patent: 6072716 (2000-06-01), Jacobson et al.
patent: 6077729 (2000-06-01), Harshfield
patent: 6084796 (2000-07-01), Kozicki et al.
patent: 6087674 (2000-07-01), Ovshinsky et al.
patent: 6117720 (2000-09-01), Harshfield
patent: 6141241 (2000-10-01), Ovshinsky et al.
patent: 6143604 (2000-11-01), Chiang et al.
patent: 6177338 (2001-01-01), Liaw et al.
patent: 6236059 (2001-05-01), Wolstenholme et al.
patent: RE37259 (2001-07-01), Ovshinsky
patent: 6297170 (2001-10-01), Gabriel et al.
patent: 6300684 (2001-10-01), Gonzalez et al.
patent: 6314014 (2001-11-01), Lowrey et al.
patent: 6316784 (2001-11-01), Zahorik et al.
patent: 6329606 (2001-12-01), Freyman et al.
patent: 6339544 (2002-01-01), Chiang et al.
patent: 6348365 (2002-02-01), Moore et al.
patent: 6350679 (2002-02-01), McDaniel et al.
patent: 6376284 (2002-04-01), Gonzalez et al.
patent: 6377499 (2002-04-01), Tobita
patent: 6388324 (2002-05-01), Kozicki et al.
patent: 6391688 (2002-05-01), Gonzalez et al.
patent: 6404665 (2002-06-01), Lowery et al.
patent: 6414376 (2002-07-01), Thakur et al.
patent: 6418049 (2002-07-01), Kozicki et al.
patent: 6423628 (2002-07-01), Li et al.
patent: 6429064 (2002-08-01), Wicker
patent: 6437383 (2002-08-01), Xu
patent: 6452834 (2002-09-01), Kengeri
patent: 6462981 (2002-10-01), Numata et al.
patent: 6462984 (2002-10-01), Xu et al.
patent: 6469364 (2002-10-01), Kozicki
patent: 6473332 (2002-10-01), Ignatiev et al.
patent: 6480438 (2002-11-01), Park
patent: 6487106 (2002-11-01), Kozicki
patent: 6487113 (2002-11-01), Park et al.
patent: 6501111 (2002-12-01), Lowery
patent: 6507061 (2003-01-01), Hudgens et al.
patent: 6511862 (2003-01-01), Hudgens et al.
patent: 6511867 (2003-01-01), Lowery et al.
patent: 6512241 (2003-01-01), Lai
patent: 6514805 (2003-02-01), Xu et al.
patent: 6531373 (2003-03-01), Gill et al.
patent: 6534781 (2003-03-01), Dennison
patent: 6545287 (2003-04-01), Chiang
patent: 6545907 (2003-04-01), Lowery et al.
patent: 6555860 (2003-04-01), Lowery et al.
patent: 6563164 (2003-05-01), Lowery et al.
patent: 6566700 (2003-05-01), Xu
patent: 6567293 (2003-05-01), Lowery et al.
patent: 6569705 (2003-05-01), Chiang et al.
patent: 6570784 (2003-05-01), Lowery
patent: 6576921 (2003-06-01), Lowery
patent: 6586761 (2003-07-01), Lowery
patent: 6589714 (2003-07-01), Maimon et al.
patent: 6590807 (2003-07-01), Lowery
patent: 6593176 (2003-07-01), Dennison
patent: 6597009 (2003-07-01), Wicker
patent: 6605527 (2003-08-01), Dennison et al.
patent: 6613604 (2003-09-01), Maimon et al.
patent: 6621095 (2003-09-01), Chiang et al.
patent: 6625054 (2003-09-01), Lowery et al.
patent: 6642102 (2003-11-01), Xu
patent: 6646297 (2003-11-01), Dennison
patent: 6649928 (2003-11-01), Dennison
patent: 6667900 (2003-12-01), Lowery et al.
patent: 6671710 (2003-12-01), Ovshinsky et al.
patent: 6673648 (2004-01-01), Lowrey
patent: 6673700 (2004-01-01), Dennison et al.
patent: 6674115 (2004-01-01), Hudgens et al.
patent: 6687153 (2004-02
Baker Jake
Moore John
Dickstein , Shapiro, Morin & Oshinsky, LLP
Dinh Son T.
Micro)n Technology, Inc.
LandOfFree
PCRAM rewrite prevention does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with PCRAM rewrite prevention, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and PCRAM rewrite prevention will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3483387