How clamp-on DC ammeters work

click to enlarge

I imagine many readers of this blog have some idea how a clamp-on AC ammeter works.  You have some wire with AC current in it, and you open the jaws of a clamp-on meter and you close them around the wire.  The alternating current makes a constantly changing magnetic field around the wire.  It is a fairly realistic goal for the jaws to capture basically all of the lines of (constantly changing) magnetic flux surrounding the wire.  If you have the luxury of being able to assume that the frequency is known (and depending on the continent where you are located, this may well be a safe assumption), you can proceed in a very straightforward way to design a simple and inexpensive and quite accurate AC ammeter. I have had this Micronta (Radio Shack) meter (seen at right) in my tool kit for some fifty years now, and it has served me very well.

But nowadays there are clamp-on DC ammeters. A wire carrying a DC current does not (by definition it does not!) generate any changing magnetic field!  A traditional meter like the one described above has nothing to measure if it is clamped onto a wire containing a DC current.   How can a clamp-on DC ammeter possibly measure a (perhaps constant) DC current? Continue reading “How clamp-on DC ammeters work”

Last day to get in your numbers for the 2022 toteboards!

Today is the last day to get in your numbers for the 2022 toteboards.  Click here to get in your numbers.

Here is what we have so far:

    • For the US utility patent toteboard — over fifty firms responding, representing over thirty thousand issued US utility patents.
    • For the US trademark registration toteboard — over fifty firms responding, representing over ten thousand granted US trademark registrations.
    • For the US design patent toteboard — over forty firms responding, representing over four thousand issued US design patents.
    • For the US plant patent toteboard — over three firms responding, representing over twenty-five US plant patents.

Get your numbers in.  The response forms will stop taking responses at the close of business today, Tuesday, January 24, 2023.

USPTO harmed a Patentcenter screen

click to enlarge

For four years now, the “applications” table in Patentcenter has had a standard column “attorney docket number”.  There have been many things wrong with the USPTO’s default design of this “applications” table from the outset, as will be reviewed below.  But one of the handful of things that the USPTO did not get wrong in its default design for the “applications” table was that it provided the attorney docket number.  Imagine, then, the disappointment in the user community when, on January 16, 2023, the USPTO abruptly eliminated the “attorney docket number” column from the “applications” table.  Continue reading “USPTO harmed a Patentcenter screen”

Not ready with complete details for your patent application? file a provisional!

I wonder if this language on the USPTO’s Patentcenter web site is bad legal advice?  The e-filing system asks “Not ready with complete details for your patent application?”  And the answer the USPTO gives is that if you are “not ready with complete details” then what you should file is a provisional patent application.  Continue reading “Not ready with complete details for your patent application? file a provisional!”

The best kind of charity

The religious scholar Maimonides from 900 years ago (Wikipedia article) wrote about lots of things including the best kinds of charity.  He fingered a telltale:  what if the donor gives anonymously?   The anonymous gift of charity is the highest kind of charity, said this religious scholar.

Which brings me to the strong emotions that I felt as I read a flurry of recent news stories about a fellow in a rural part of Alabama who did not have very much money, but who (after his recent death, it comes out for the first time) had been dropping by a local pharmacy for some ten years and had been handing the pharmacist a $100 bill each month with instructions that the money should be applied toward prescriptions for people who could not afford their drug prescriptions.

One of his very strict instructions to the pharmacy was that nobody was to be told where the money came from. Continue reading “The best kind of charity”

Some firms have gotten in their numbers for the 2022 toteboards

The 2022 toteboards will get published in February of 2023.  Every year, we publish the toteboards, and after that, some firm comes in begging and pleading to hand in its numbers late.  Please don’t do that.  Please hand in your numbers before Tuesday, January 24, 2023!

As of just now, lots of firms have already handed in their numbers for the 2022 toteboards:  Continue reading “Some firms have gotten in their numbers for the 2022 toteboards”

Incremental progress on finding ways to use Patent Public Search

Folks, I have experimented quite a bit in the past 24 hours, trying to figure out a bit more about how to trick the clunky Patent Public Search system into yielding up answers for the 2022 toteboards.  Here are my bits of incremental progress on ways to trick the PPS search system into giving you numbers that you might be able to use for the toteboards.

The date search portion of the search.   To get patents issuing in calendar 2022, it looks like either of these search strings might work:

@PD>=”20220101″<=20221231

or

“2022”.py.

The latter is a smaller character count and is easier to type without error.  Maybe it executes faster in the PPS system.

The application type or patent type portion of the search.  To get, say, only utility patents, it looks like this might work:

(b1.AT. or b2.AT.)

This search string tries to get issued US utility patents that did not have a previous publication (B1) merged with issued US utility patents that did have a previous publication (B2).

To get, say, only plant patents, it looks like this might work:

(p2.at. or p3.at.)

This search string tries to get issued US plant patents that did not have a previous publication (P2) merged with issued US plant patents that did have a previous publication (P3).

To get, say, only design patents, it looks like this might work:

s.AT.

Recapping progress thus far.  Thus for example if you want to know simply how many utility patents issued in 2022, it looks like this might work:

(b1.AT. or b2.AT.) and “2022”.py.

The answer seems to be 322992 issued utility patents in 2022.

The number of design patents might work with this:

s.AT. and “2022”.py.

The answer seems to be 34158 issued design patents in 2022.

The number of plant patents might work with this:

(p2.AT. or p3.AT.) and “2022”.py.

The answer seems to be 1072 issued plant patents in 2022.

Narrowing it down to the firm name.    We can then use any of the previous three search strings along with further field searching to try to narrow the search down to the firm name.  The poor documentation for PPS suggests that any of the following might possibly yield legal-representative-specific results:

    • .att.  – said to mean “Attorney/agent/firm”
    • .atty. – said to mean “Attorney name”
    • .firm. – said to mean “Legal Firm Name”
    • .inaa. – said to mean “Legal Representative or Inventor”
    • .lrag. – said to mean “Legal Representative Name”
    • .lrnm. – said to mean “Legal Representative Name”
    • .lrfm. – said to mean “Legal Firm Name”

Within any one of these fields, the hapless searcher might want to try any of several proximity operators:  ADJ, ADJ(n), NEAR, NEAR(n), WITH, WITH(n), SAME, or SAME(n).  Some searchers will try AND within a field search.  Toteboard searchers have tried strings including:

    • (plinge AND llp).att.
    • baker adj charlie.lrfm.
    • (able and charlie).lrfm

Yes, it looks like you can omit the parentheses because I guess “ADJ” binds more strongly than the field name.

For our firm, the following search strings seemed to work:

    • oppedahl.att. (“Attorney/agent/firm”)
    • oppedahl.atty. (“Attorney name”)
    • oppedahl.firm. (“Legal Firm Name”)
    • oppedahl.lrfm. (“Legal Firm Name”)

The following search strings came up empty:

    • oppedahl.inaa. (“Legal Representative or Inventor”)
    • oppedahl.lrag. (“Legal Representative Name”)
    • oppedahl.lrnm. (“Legal Representative Name”)

One firm tried a search like this:

(((“Plinge Patent Law”).firm. OR (“Plinge Patent Law”).inaa. OR (“Plinge Patent Law”).lrag. OR (“Plinge Patent Law”).lrnm. OR (“Plinge Patent Law”).lrfm. )

Part of what the firm was doing, I guess, was trying to get the benefit of any of the search fields that might possibly work (inaa, lrag, and so on).  Another part of what the firm was doing, I guess, was to put three words of the firm name into quotation marks, to try to exclude nuisance hits from other firms with somewhat similar firm names.