![]() Original Assignee Comsat Corp Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US00170929A Inventor W Schmidt O Gabbard J Husted W Maillet H Haeberle Current Assignee (The listed assignees may be inaccurate. Google Patents Tdma satellite communications system with improved acquisitionĭownload PDF Info Publication number US3812430A US3812430A US00170929A US17092971A US3812430A US 3812430 A US3812430 A US 3812430A US 00170929 A US00170929 A US 00170929A US 17092971 A US17092971 A US 17092971A US 3812430 A US3812430 A US 3812430A Authority US United States Prior art keywords burst data signal phase square wave Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US3812430A - Tdma satellite communications system with improved acquisition You can refine your search by combining the Boolean operators AND or OR with proximity operators.US3812430A - Tdma satellite communications system with improved acquisition You can enter up to ten classification symbols in the search field, each separated by a space, and the system will use the default Boolean operator AND. If an application has been assigned a classification combination set, this is displayed in the Bibliographic data panel under C-sets.Ĭlassification combination sets can only be searched in Smart search with the field identifier cpcc The scope of a combination set can vary across technical fields. Combination sets classify technical features in context or "taken in combination". These are ordered lists of linked CPC symbols created by patent examiners. This is called a combination set ("C-set", "combi set"). In some cases patent applications are assigned more than one classification symbol. Classification combination sets (C-sets, combi-sets) To restrict your search to either the CPC or the IPC, use cpc or ipc as the field identifier. If you do not enter a field identifier and your search term conforms to the CPC or IPC pattern, the search engine will automatically recognise your search term as a classification symbol and use cl as the general field identifier. In Smart search, you can enter the classification symbol(s) with or without the field identifier. You can then browse the CPC scheme for more information and to find other classification symbols that might also be relevant for your search in a specific technical field. In Classification search enter the classification symbol in the search field and click Search. ![]() Entering the group alone will automatically retrieve all subgroups. do not enter A63B49*, if you want to find all child levels of this group. A63B 2049/0235, omit this blank, otherwise your search will not retrieve any results.ĭo not use wildcards in classification symbols, e.g. ![]() If you encounter a symbol printed with a blank after the fourth letter or digit, e.g. You can enter a64b49 or A63B49 or any other combination of uppercase and lowercase letters.ĭo not enter blanks in classification symbols. A63B2049/0282Ĭlassification symbols are not case-sensitive. It may therefore be worthwhile carrying out certain searches twice: once using keywords and once using CPC and IPC classification symbols.ĭepending on the classification level you require, you should enter the classification symbols as follows: You should bear in mind that when you search with a CPC or IPC symbol, you can only find documents to which a CPC or IPC symbol has actually been assigned. However, if these documents have a classification symbol, they can be found using that symbol. Certain documents cannot be found with a keyword search, because you cannot search for keywords in documents which do not have a title or abstract. The results of searching with keywords are less precise the further your choice of words differs from that of the applicant. Searching with classification symbols offers advantages over searching with keywords. This makes it easier to manage and to search for patent applications in a given technical field They are assigned classification symbols, for example A43B49. Patent applications are classified in classification schemes on the basis of their technical content.
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