PRINCE MANUFACTURING, INC.

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Patent Activity in the Last 10 Years

Technologies

Intl Class Technology Matters Rank in Class
 
  
 
F01B MACHINES OR ENGINES, IN GENERAL OR OF POSITIVE-DISPLACEMENT TYPE, e.g. STEAM ENGINES 126

Top Patents (by citation)

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Recent Publications

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Recent Patents

Patent # Title Filing Date Issue Date Intl Class
D394094 Tennis racquetMay 06, 93May 05, 98[2199]
5400695 Method and device for locking cylindrical members togetherMar 08, 94Mar 28, 95[F01B]

Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
6926034 Hydraulic spool lock and method of useExpiredJan 24, 03Aug 09, 05[F16K, G05G]
6725761 Spooling device assembly for hydraulic cylinder and method of assembling sameExpiredSep 30, 02Apr 27, 04[F01B]
5322279 Double strung tennis racquetExpiredAug 16, 93Jun 21, 94[A63B]
5238247 Mono-shaft sports racquetExpiredMar 12, 92Aug 24, 93[A63B]
D326698 Badminton racquetExpiredMar 04, 91Jun 02, 92[]
5071124 Badminton racquetExpiredMay 03, 90Dec 10, 91[A63B]
5037098 Tennis racquet with tapered profile frameExpiredFeb 07, 90Aug 06, 91[A63B]
4983242 Tennis racquet having a sandwich construction, vibration-dampening frameExpiredNov 02, 88Jan 08, 91[B32B]
4858340 Shoe with form fitting soleExpiredFeb 16, 88Aug 22, 89[A43B]
4771678 Piston locking device for double acting hydraulic cylinderExpiredNov 23, 87Sep 20, 88[F01B]
4670998 Navicular support tennis shoeExpiredJan 28, 86Jun 09, 87[A43B]
4417729 Racket stringing apparatusExpiredFeb 26, 82Nov 29, 83[A63B]
4386552 Power cylinder with internally mounted position indicatorExpiredFeb 09, 81Jun 07, 83[F01B]
4337687 Poppet trip device for hydraulic cylindersExpiredMay 23, 80Jul 06, 82[F15B]
4291665 Propulsion device for spherical objects having an oscillating support frame providing a programmed discharge of said objectsExpiredOct 26, 79Sep 29, 81[F41F, A63B]
4233953 Propulsion device for tennis balls and like spherical objects having an improved programmed discharge of the oscillatory typeExpiredOct 30, 78Nov 18, 80[F41F, A63B]

Top Inventors for This Owner

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