Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: Beating a Dead Horse (aka Worley's Sextant)
    From: Don Seltzer
    Date: 2014 Jan 20, 11:19 -0800

    Brad wrote; Of course, since my device does say 'patent' it implies that there is an earlier version by the same patentees, on the same topic. You've got the later one, but its the earlier one we seek!

    I did look for an earlier patent that included the Greatest Angle Clamp, but could not find one prior to 1921. I do not know what to make of your earlier one being stamped 'Patent'. Perhaps it was just a marketing ploy, to scare off copycats, suggesting (perhaps falsely) that an application had been filed and was pending. It didn't have to be true; I don't imagine that in the early 1900's there was a law prohibiting such a practice.

    There was an earlier suggestion that an invention might be sold for several years before a patent application was submitted. In recent decades at least, that has not been true. A patent cannot be awarded for prior art, and anything that is published or manufactured prior to the application date is considered prior art. Until last year, the US Patent Office allowed a one year grace period between first public disclosure and filing, but in Europe and Japan, the rule has long been that the patent application must be filed before any public disclosure. I do not know if this was the rule 100 years ago.

    Don Seltzer
    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]fer3.com
    ----------------------------------------------------------------

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site