The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 16, 1989
Filed:
Nov. 13, 1987
Applicant:
Inventor:
Ray F Stewart, Redwood City, CA (US);
Assignee:
Landec Labs, Inc., Redwood City, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A61F / ; A61K / ;
U.S. Cl.
CPC ...
424448 ; 424416 ; 424449 ; 424484 ; 424486 ; 424487 ;
Abstract
Temperature-controlled diffusional active agent dispensers that use a side-chain crystallizable polymer in a form that is not free to flow above its melt temperature as a rate-controlling matrix are disclosed. The polymer may be crosslinked to render it nonflowable, be supported, or grafted to a permeable support. Elements that facilitate or permit heating by radiation or electrical conductance/inductance may be included in the dispenser. At temperatures below the melt temperature of the polymer, the polymer is substantially impermeable to the agent. At tempertures at or above the melt temperature the polymer is substantially permeable to the agent.
Published as:
US4830855A; EP0317180A1; WO8904648A1; ZA888421B; KR890701076A; NZ226921A; PH24852A; JPH03502195A; EP0317180B1; ATE78703T1; DE3873275D1; DE3873275T2; ES2034260T3; AR244087A1; JPH0618788B2; IL88315A; KR0131598B1;