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• 15 United States
• 10 France
• 8 Japan
• 7 China
• 5 Korea
• 2 Other

Patent Owner(s)

Patent Owner	Address
PHARMACEUTICAL DELIVERY SYSTEMS INC A CORP OF CALIFORNIA	545 MIDDLEFIELD ROAD MENLO PARK CA

International Classification(s)

• C08G:MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN B....

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• [Patents Count]

Inventor(s)

Inventor Name	Address	# of filed Patents	Total Citations
Heller, Jorge	Woodside, CA	64	2385
Ng, Steve Y W	San Francisco, CA	9	391
Penhale, Donald W H	Menlo Park, CA	8	285

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Maintenance Fees

Fee	Large entity fee	small entity fee	micro entity fee	due date

Fee	Large entity fee	small entity fee	micro entity fee
Surcharge after expiration - Late payment is unavoidable	$700.00	$350.00	$175.00
Surcharge after expiration - Late payment is unintentional	$1,640.00	$820.00	$410.00

Full Text

US Patent No: 4957998

Polymers containing acetal, carboxy-acetal, ortho ester and carboxyortho ester linkages

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