Patents
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Learn MoreKeywords and boolean syntax (USPTO or EPO format): seat belt searches these two words, or their plurals and close synonyms. "seat belt" searches this exact phrase, in order. -seat -belt searches for documents not containing either word.
For searches using boolean logic, the default operator is AND with left associativity. Note: this means safety OR seat belt is searched as (safety OR seat) AND belt. Each word automatically includes plurals and close synonyms. Adjacent words that are implicitly ANDed together, such as (safety belt), are treated as a phrase when generating synonyms.
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Learn MoreSearch specific patents by importing a CSV or list of patent publication or application numbers.
Gridded electron tube with dispenser cathode having coated surface portions
US3402314A
United States
- Other languages
English - Inventor
Vlaardingerbroek Marinu Teunis Dorgelo Eduard Gerhardus - Current Assignee
- US Philips Corp
- North American Philips Co Inc