constantino-ga,
Your question doesn't lend itself to a simple answer.
As you may know, there are quite a number of distinct patents
pertaining to Viagra, that cover manufacturing processes for the drug,
various formulations, and various uses in treatments.
In addition, there are now quite a number of regional patent
protection programs that provide patents for, e.g. broad areas in
Europe or Africa, and these protections include many individual
countries.
Fortunately, it is possible to conduct fairly comprehensive, worldwide
patent searches through the excellent (if somewhat cumbersome) search
tool provided by the European Patent Office, which covers patents not
only from Europe, but for many other countries around the world --
I've included a list of the countries below.
The European Patent Office search tools is here:
http://ep.espacenet.com/search97cgi/s97_cgi.exe?Action=FormGen&Template=ep/en/advanced.hts
A search for the term [ sildenafil ] in the patent title (sildenafil
is the chemical name for Viagra) and [ Pfizer ] in the applicant field
turned up a number of relevant patents -- you should try the search
yourself to see the results.
The key patents are listed below, along with corresponding patents
from other countries, where applicable. Of the countries you listed
in your question, only the Czech Republic is explicilty listed in the
results below. However, patent protection may also be afforded by the
more generic European-wide patents that have been issued.
I trust the information below fully answers your question.
However, please don't rate this answer until you have everything you
need. If you would like any additional information, just post a
Request for Clarification to let me know how I can assist you further,
and I'm at your service.
All the best,
pafalafa-ga
===============
Intermediate compound for preparing sildenafil
HK1033459 - 2005-02-08 HONG KONG
Also published as:
EP0812845 (A1) EUROPE
US5955611 (A1) US
TR9700470 (A2) TURKEY
OA10426 (A) AFRICA
MA24205 (A1) [NOT SURE WHICH COUNTRY THIS IS]
JP11171879 (A) JAPAN
JP10081688 (A) JAPAN
AP717 (A) AFRICA
EP0812845 (B1) EUROPE
SK283897B (B6) SLOVAKIA
SK283896B (B6) "
SK283895B (B6) "
SK283894B (B6) "
SK283893B (B6) "
EA102 (B1) EURASIAN PATENTS
DE69723846T (T2) GERMANY
DE69723846D (T2) GERMANY
CZ290942 (B6) CZECH REPUBLIC
BG62554 (B1) BULGARIA
USE OF SILDENAFIL AND OTHER COMPOUNDS WITH PDE5 ACTIVITY FOR THE
PREPARATION OF PHARMACEUTICAL COMPOSITION TREATING PREMATURE
EJACULATION
HU0301915 - 2003-09-29 HUNGARY
Also published as:
WO0240027 (A1) WORLD INTELLECTUAL PROPERTY OFFICE (WIPO)
CA2429114 (A1) CANADA
EP1335730 (B1) EUROPE
Process for preparing sildenafil
US6066735 - 2000-05-23 US
Intranasal formulations for treating sexual disorders comprising
Viagra or sildenafil mesylate in particular crystalline mono or
dihydrate
NZ336382 1999-11-29 NEW ZEALAND
Also published as:
EP0967214 (A1) EUROPE
US2002040139 (A1) US
TR9901444 (A2) TURKEY
OA11069 (A) AFRICA
JP2000034232 (A) JAPAN
CA2275554 (A1) CANADA
EP0967214 (B1) EUROPE
EA1903 (B1) EURASIAN
CZ294856 (B6) CZECH REPUBLIC
AU746865 (B2) AUSTRALIA
Oral pharmaceutical formulations comprising sildenafil in free base
form for the treatment of male impotence and female sexual disorders
NZ335772 - 2000-12-22 NEW ZEALAND
Also published as:
EP0960621 (A2) EUROPE
TR9901077 (A2) TURKEY
OA11040 (A) AFRICA
JP11349483 (A) JAPAN
EP0960621 (A4) EUROPE
EP0960621 (A3) EUROPE
CA2272042 (A1) CANADA
AU753478 (B2) AUSTRALIA
Preparation of the sildenafil precursor 4- not
2-ethoxy-5-(4-methylpiperazin-1-ylsulfonyl)-benzamido 3/4 -1-methyl
3-n-propylpyrazole-5-carboxamide and the
2-ethoxy-5-(4-methylpiperazin-1-ylsulfonyl)-benzoic acid intermediate
therefor
IL125411 - 2000-02-29 ISRAEL
Process for preparing sildenafil
SI916675T - 2003-12-31 SLOVENIA
Process for preparing sildenafil
SI812845T 1999-12-31 SLOVENIA
Also published as:
EP0916675 (A2) EUROPE
EP0916675 (A3) "
EP0916675 (B1) "
Process for preparing sildenafil
TW391961 - 2000-06-01 TAIWAN
===============
The European Patent Office database appears to be fairly
comprehensive, but it should not be taken as 100% complete. For
instance, I am aware of a Pfizer patent in China for Viagra, but this
did not show up in the current search. This may be partly the result
of the inherent difficulties of meshing datasources that do not use
the same alphabets.
===============
The countries (and in some cases, regions) represented in the European
Patent Office database are the following:
Country codes
Country codes are two letters indicating the country or organisation
where the patent application was filed or granted (eg GB). The list of
countries covered by our worldwide database is shown in this table:
CC Name
AP African Regional Industrial Property Organization
AR Argentina
AT Austria
AU Australia
BA Bosnia and Herzegovina
BE Belgium
BG Bulgaria
BR Brazil
CA Canada
CH Switzerland
CN China
CS Czechoslovakia (up to 1993)
CU Cuba
CY Cyprus
CZ Czech Republic
DD Germany, excluding the territory that, prior to 3 October 1990,
constituted the Federal Republic of Germany
DE Germany
DK Denmark
EA Eurasian Patent Organisation
EE Estonia
EG Egypt
EP European Patent Office
ES Spain
FI Finland
FR France
GB United Kingdom
GR Greece
HK Hong Kong
HR Croatia
HU Hungary
IE Ireland
IL Israel
IN India
IT Italy
JP Japan
KE Kenya
KR Republic of Korea
LT Lithuania
LU Luxembourg
LV Latvia
MC Monaco
MD Republic of Moldova
MN Mongolia
MT Malta
MW Malawi
MX Mexico
MY Malaysia
NC New Caledonia
NL Netherlands
NO Norway
NZ New Zealand
OA African Intellectual Property Organization
PH Philippines
PL Poland
PT Portugal
RO Romania
RU Russian Federation
SE Sweden
SG Singapore
SI Slovenia
SK Slovakia
SU Union of Soviet Socialist Republics (USSR)
TJ Tajikistan
TR Turkey
TT Trinidad and Tobago
TW Taiwan
US United States of America
VN Vietnam
WO World Intellectual Property Organisation (WIPO)
YU Yugoslavia
ZA South Africa
ZM Zambia
ZW Zimbabwe
Again, let me know if there's anything else I can do for you on this.
pafalafa-ga |