US Patent No: 4,600,845

Number of patents in Portfolio can not be more than 2000

Fault-tolerant clock system

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ATTORNEY / AGENT: (SPONSORED)
 

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Abstract

A clock generator source, a plurality of which can be used as redundant clock sources in a fault tolerant clock system. The input and output clock signals of said source being formed of a plurality of pulses having a frequency substantially higher than the frequency of the input and output signals, one pulse being omitted in each cycle thereof to form a "dead interval" therein when the input and output signals are in phase. When the output signal is not in phase with the input signal at the start of a cycle the length of the cycle of the output signal is either lengthened or shortened by inserting a second dead interval or omitting the dead interval, respectively, to bring the input and output signals in phase by the end of the cycle.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
THE CHARLES STARK DRAPER LABORATORY, INC.CAMBRIDGE, MA555

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
McKenna, Jr John F Gloucester, MA 5 67

Cited Art

Patent Info (Count) # Cites Year
 
BELL TELEPHONE LABORATORIES, INCORPORATED (1)
4,373,204 Phase locked loop timing recovery circuit 7 1981
 
TELECOMMUNICATIONS RADIOELECTRIQUES ET TELEPHONIQUES T.R.T. (1)
4,309,662 Circuit for rapidly resynchronizing a clock 16 1980

Patent Citation Ranking

Forward Cites

Patent Info (Count) # Cites Year
 
ALTERA CORPORATION (1)
7,990,783 Postamble timing for DDR memories 0 2011
 
RPX CORPORATION (1)
4,737,722 Serial port synchronizer 4 1985
 
SEIKO INSTRUMENTS INC. (1)
6,154,070 Control circuit and semiconductor integrated circuit device 1 1998
 
ST. CLAIR INTELLECTUAL PROPERTY CONSULTANTS, INC. (1)
4,669,098 Increased resolution counting circuit 3 1986
 
THE BOEING COMPANY (1)
4,979,191 Autonomous N-modular redundant fault tolerant clock system 19 1989
 
YAKISAMI CAPITAL CO. L.L.C. (1)
5,377,205 Fault tolerant clock with synchronized reset 12 1993