Edward W. Gronenthal

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Shelton, CT, US

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Patents Grantslast 30 patents

Information Patent Grant
Retraction/extension mechanism for variable diameter rotors
- Patent number 5,642,982
- Issue date Jul 1, 1997
- Sikorsky Aircraft Corporation
- David G. Matuska
- B64 - AIRCRAFT AVIATION COSMONAUTICS
Information Patent Grant
Torque tube/spar assembly for variable diameter helicopter rotors
- Patent number 5,636,969
- Issue date Jun 10, 1997
- Sikorsky Aircraft Corporation
- David G. Matuska
- B64 - AIRCRAFT AVIATION COSMONAUTICS
Information Patent Grant
Rotor system having alternating length rotor blades and positioning...
- Patent number 5,620,304
- Issue date Apr 15, 1997
- Sikorsky Aircraft Corporation
- David G. Matsuka
- B64 - AIRCRAFT AVIATION COSMONAUTICS