FAQ  &  STATSTM

Facts and statistics one might like to know!



US Patent Numbers and Their Dates



 1850
6,981
 1855
12,601
 1860
25,279
 1865
48,969
 1870
98,471
 1875
158,350
 1880
232,978
 1885
310,163
 1890
418,655
 1895
531,619
 1900
640,167
 1905
778,834
 1910
945,010
 1915
1,128,212
 1920
1,326,899
 1925
1,521,590
 1930
1,742,181
 1935
1,985,878
 1940
2,185,170
 1945
2,366,154
 1950
2,492,944
 1955
2,689,434
 1960
2,919,443
 1965
3,163,865
 1970
3,487,470
 1975
3,858,241
 1980
 1985
 1990
 1995
 2000
 




World Patent Offices



English System vs. Metric System






Centimeter to Inch converter

cm
feet
inch







Distance




Prefix 
kilo
hecto 
deka 
meter 
deci 
centi 
milli 
Abbreviation
k
h
dk
m
d
c
m
Example
kilometer
hectometer
dekameter
meter
decimeter
centimeter
millimeter
Multiplier
1,000
100
10
1
0.1
0.01
0.001



Conversion Chart

1 centimeter = 0.3937 inches
12 inches = 1 foot
1 inch = 2.54 centimeters
1 foot = 0.3048 meters
1 foot = 30.48 centimeters
3 feet = 1 yard
1760 yards = 1 mile
5280 feet = 1 mile
1 yard = 0.9144 meters
1 meter = 3.28083 feet
1 kilometer = 3281 feet
1 kilometer = 0.6214 miles
3 miles = 1 league




Volume




Prefix 
kilo
hecto 
deka 
liter 
deci 
centi 
milli 
Abbreviation
k
h
dk
m
d
c
m
Example
kiloliter
hectoliter
dekaliter
liter
deciliter
centiliter
milliliter
Multiplier
1,000
100
10
1
0.1
0.01
0.001




Mass




Prefix 
kilo
hecto 
deka 
gram 
deci 
centi 
milli 
Abbreviation
k
h
dk
m
d
c
m
Example
kilogram
hectogram
dekagram
gram
decigram
centigram
milligram
Multiplier
1,000
100
10
1
0.1
0.01
0.001



Metric Conversion Table

metric ton =1,000,000 grams
kilogram =1,000 grams
hectogram =100 grams
decagram =10 grams
decigram =0.1 grams
centigram =0.01grams
milligram =0.001 grams




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