Hi Attila:
Once you find a patent you can then search on the class number for very
similar patents.
See the links under "Handy External Links:"
http://www.prc68.com/I/Learning.shtml
Quick allows searching for a class number or other fields (but not the text of
the patent).
PS Sunnyvale has a patent library where they file US patents by class number
making manual searches fairly easy.
Top Level Class # <http://www.uspto.gov/go/classification/selectbynum.htm> (left) allows you to see the meaning of the
class to be sure that's what you're interested in.
US 4358741 <https://www.google.com/patents/US4358741> Micro time and phase stepper, 331/2
<https://www.google.com/url?id=rl0dBAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc331/defs331.htm&usg=AFQjCNHhVSrSreshQPR_PYhdLJ0aw9tBCQ#C331S002000>,
327/161
<https://www.google.com/url?id=rl0dBAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc327/defs327.htm&usg=AFQjCNFoZx7H6EhU2a-QMFPGAY1I73oBzw#C327S161000>,
333/18
<https://www.google.com/url?id=rl0dBAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc333/defs333.htm&usg=AFQjCNF4ObmgvfHFQi9OPkPToOvejSWAZg#C333S018000>,
331/25
<https://www.google.com/url?id=rl0dBAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc331/defs331.htm&usg=AFQjCNHhVSrSreshQPR_PYhdLJ0aw9tBCQ#C331S025000>
CLASS 331, OSCILLATORS
2 Plural oscillators controlled:
<javascript:poptastic('../shadowFiles/defs331sf.htm?331_2&D&2&3');>
25 Signal or phase comparator:
<javascript:poptastic('../shadowFiles/defs331sf.htm?331_25&D&2&J&Q');>
CLASS 327,MISCELLANEOUS ACTIVE ELECTRICAL NONLINEAR DEVICES, CIRCUITS, AND
SYSTEMS
161 With delay means:
<javascript:poptastic('../shadowFiles/defs327sf.htm?327_161&D&2S&3X&4H');>
286 With counter:
<javascript:poptastic('../shadowFiles/defs327sf.htm?327_286&D&2S&79&7X&7Y');>
US 4417352 <https://www.google.com/patents/US4417352?dq=US4417352> Microphase stepper employing improved digital timing
incrementer employing a rate multiplier, 377/43
<https://www.google.com/url?id=Jt8eBAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc377/defs377.htm&usg=AFQjCNES34nVJJvy1BQF6eXy2lUwpG20wg#C377S043000>,
377/47
<https://www.google.com/url?id=Jt8eBAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc377/defs377.htm&usg=AFQjCNES34nVJJvy1BQF6eXy2lUwpG20wg#C377S047000>,
327/286
<https://www.google.com/url?id=Jt8eBAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc327/defs327.htm&usg=AFQjCNFoZx7H6EhU2a-QMFPGAY1I73oBzw#C327S286000>,
377/52
<https://www.google.com/url?id=Jt8eBAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc377/defs377.htm&usg=AFQjCNES34nVJJvy1BQF6eXy2lUwpG20wg#C377S052000>
CLASS 377,ELECTRICAL PULSE COUNTERS, PULSE DIVIDERS, OR SHIFT REGISTERS:
CIRCUITS AND SYSTEMS
43 Having phase shift:
<javascript:poptastic('../shadowFiles/defs377sf.htm?377_43&D&T&19');>
47 Pulse multiplication or division:
<javascript:poptastic('../shadowFiles/defs377sf.htm?377_47&D&T&1D');>
52 With programmable counter (i.e., with variable base):
<javascript:poptastic('../shadowFiles/defs377sf.htm?377_52&D&T&1I');>
US 5440313 <https://www.google.com/patents/US5440313> GPS synchronized frequency/time source (Q5200
<http://www.prc68.com/I/Q5200.shtml>), 342/352
<https://www.google.com/url?id=vp08BAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc342/defs342.htm&usg=AFQjCNHmJcOXqM2sgcclreqTZjYK9v88aQ#C342S352000>,
375/362
<https://www.google.com/url?id=vp08BAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc375/defs375.htm&usg=AFQjCNFcuagMfSu6xvEzMh0uBF37Cw37ZA#C375S362000>,
368/200
<https://www.google.com/url?id=vp08BAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc368/defs368.htm&usg=AFQjCNH9PXe6MYSffVhm9JQ8TwfbzXRIrA#C368S200000>,
342/357.29
<https://www.google.com/url?id=vp08BAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc342/defs342.htm&usg=AFQjCNHmJcOXqM2sgcclreqTZjYK9v88aQ#C342S357290>,
342/357.42
<https://www.google.com/url?id=vp08BAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc342/defs342.htm&usg=AFQjCNHmJcOXqM2sgcclreqTZjYK9v88aQ#C342S357420>,
342/357.59
<https://www.google.com/url?id=vp08BAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc342/defs342.htm&usg=AFQjCNHmJcOXqM2sgcclreqTZjYK9v88aQ#C342S357590>,
342/357.68
<https://www.google.com/url?id=vp08BAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc342/defs342.htm&usg=AFQjCNHmJcOXqM2sgcclreqTZjYK9v88aQ#C342S357680>,
342/357.48
<https://www.google.com/url?id=vp08BAABERAJ&q=http://www.uspto.gov/web/patents/classification/uspc342/defs342.htm&usg=AFQjCNHmJcOXqM2sgcclreqTZjYK9v88aQ#C342S357480>
CLASS 342,COMMUNICATIONS: DIRECTIVE RADIO WAVE SYSTEMS AND DEVICES (E.G.,
RADAR, RADIO NAVIGATION)
352 Including a satellite:
<javascript:poptastic('../shadowFiles/defs342sf.htm?342_352&D&60&62');>
CLASS 368,HOROLOGY: TIME MEASURING SYSTEMS OR DEVICES
200 For adjusting the frequency or beat:
<javascript:poptastic('../shadowFiles/defs368sf.htm?368_200&D&54&5K');>
CLASS 375, PULSE OR DIGITAL COMMUNICATIONS
62 Frequency or phase control using synchronizing signal:
<javascript:poptastic('../shadowFiles/defs375sf.htm?375_362&D&5F&5N');>
I haven't shown all of the class number detail, but there's a lot of class
numbers to look at.
--
Have Fun,
Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
http://www.prc68.com/I/DietNutrition.html
Attila Kinali wrote:
Moin,
I just tried to figure out how phase microsteppers are usually build,
but, beside the time-nuts discussion from 10 years ago and US patents
US4358741 and US4417352 my search turned out empty. I am pretty sure
that I used the wrong search terms and there should be lots of documentation
out there. Can someone give me a hint what to look for?
Attila Kinali
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