MARCH 14, 1916 PATENT NUMBER 1,175,687
MARC. BIRKIGT, BOIS-COLOMBES, FRANCE
********* THE CLEARANCE RAMP *******
 

UNDERCUTTING OF THE BASECIRCLE TO ALLOW CHANGES IN THE VALVE LASH FROM COLD TO HOT.
 

JANUARY 29, 1918 PATENT NUMBER 1,254,840
OWEN M. NACKER, DETROIT, MICHIGAN
*** THE CONSTANT VELOCITY RAMP ***
 

NOVEMBER 2, 1920 PATENT NUMBER 1,357,413
EUGENE V. MYERS, EAST ORANGE, NJ
*** DWELL AT MAXIMUM CAM LIFT ***
 

JANUARY 18, 1921 PATENT NUMBER 1,365,735
EARL H. SHERBONDY, DETROIT, MI.
*** THE CLEARANCE RAMP (AGAIN) ***
BUT, TANGENT TO THE BASECIRCLE AND CAM LIFT.
 

JULY 12, 1927 PATENT NUMBER 1,635,304
FOREST S. BASTER, DETROIT, MICHIGAN
*NON-SYMMETRICAL DESIGN WITH A SLOW CLOSING SIDE*

008" BASECIRCLE UNDERCUT ON THE OPENING SIDE WITH .016" UNDERCUT ON THE CLOSING SIDE.

APRIL 22, 1930 PATENT NUMBER 1,755,817
RAYMOND H. DIBLEY, BATHURST, NEW SOUTH WALES, AUSTRALIA.
** SPECIFIC VALVE TIMING FOR COMBUSTION CONTROL **

AUGUST 11, 1942 PATENT NUMBER 2,292,728
HEINRICH WALTI, WINTERTHUR-WULFINGEN, SWITZERLAND
ASSIGNED TO SULZER FRERES, SOCIETE ANONYME, WINTER, SWITZERLAND

*ROLLER PROFILES WITH A NARROW BASECIRCLE WIDTH*

SEPTEMBER 11, 1951 PATENT NUMBER 2,567,689
JOHN L. H. BISHOP, BIRMINGHAM ENGLAND
ASSIGNED TO THE AUSTIN MOTOR COMPANY, LIMITED BIRMINGHAM, ENGLAND.
***** FIRST REFERENCE TO MATHMETICS, SINE WAVE ACCELERATIONS *****

BOTH POSITIVE AND NEGATIVE AREAS. ECCENTRICITY (VELOCITY), INSTANTANEOUS RADIUS AND ACCELERATION DISCUSSED. FIRST REFERENCES TO MICHAEL C. TURKISH'S BOOK, "VALVE GEAR DESIGN", PUBLISHED 1946.

FEBRUARY 17, 1953 PATENT NUMBER 2,628,605
JOHN F. JONES, BERKLEY, MI;  FRED F. TIMPNER, BIRMINGHAM, MI
AND ROBERT C. JUVINALL, CHICAGO, IL.
ASIGNED TO CHRYSLER CORPORATION.
***** SINE-COSINE FORMULAS PATENTED *****

HIGH SPEED OVERHEAD VALVE ENGINES WITH SMOOTH AND DURABLE PERFORMANCE. JERK AND JOUNCE (SNAP) MENTIONED. FIRST PATENT THAT USES THE WEIGHT OF THE VALVE TRAIN IN THE EQUATIONS. SPRING RATE, SPRING FACTOR AND ENGINE SPEED USED IN CALCULATIONS.

SEPTEMBER 3, 1957 PATENT NUMBER 2,804,863
WOLF-DIETER BENSINGER AND DIETRICH KURZ
STUTIGART-UNTERTURKHEIM, GERMANY
ASSIGNED TO DAIMLER-BENZ AKTIENGESELLISCHAFT (MERCEDES).
***** POLYNOMIAL CURVE OF HIGH DEGREE *****
USED ONLY FOR THE NEGATIVE ACCELERATION AREA OF THE CAM DESIGN.

MAY 15, 1962 PATENT NUMBER 3,034,363
WILHELM VOGEL, STUGART-BAD CANNSTATT, GERMANY
ASSIGNED TO ROBERT BOSCH G.M.B.H.
***** CAM DESIGN BY DIFFERENTIAL EQUATION *****
USING HERTZIAN COMPRESSION.

OCTOBER 1, 1968 PATENT NUMBER 3,403,667
JOHN D. SANTI, WEST ALLIS, WISCONSIN
ASSIGNED TO BRIGGS & STRATTON CORP, MILWAUKEE, WI.
*** CAM PROFILE DESIGN FOR A COMPRESSION RELIEF ***

FOR STARTING SINGLE CYLINDER ENGINES. REQUIRES THE MODIFICATION OF THE INTAKE CLOSING POINT ONLY.

SEPTEMBER 21, 1976 PATENT NUMBER 3,981,281
GERHARD DESCHLER; DIETER WITTMANN;
REINHOLD TRIER ALL OF NURNBERG, GERMANY
ASSIGNED TO MASCHINENFABRIK AUGSBURG-NURNBERG AG, NURNBERG, GERMANY.
***** ACCELERATION AND DECELERATION DEFINED BY A FOURIER SERIES *****
OF THE THIRD ORDER.

APRIL 18, 1978 PATENT NUMBER 4,084,568
KAZUNOBU SATO, WAKO, JAPAN; TAKANORI SUZUKI;
TADATAKA KOBAYASHI BOTH OF TOKYO, JAPAN
ASSIGNED TO HONDA GIKEN KOGYO KABUSHIKI KAISHA, TOKYO, JAPAN.
***** INTAKE CLOSING & "RE-OPENING" RAMP *****

FOR DECOMPRESSION AND IMPROVED STARTING CHARACTERISTICS.