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US5446157A Expired / Lapsed US ⏱️ 0.0 years remaining

Boron difluoride compounds useful in photodynamic therapy and production of laser light

Assignee: Bo-Dekk Ventures Ltd
•
Filing: 1993-02-19
•
Granted: 1995-08-29
•
Expires: 2013-02-19
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Abstract

Abstract A new group of fluorescent organic compounds having a variety of uses are described. They are especially useful as dye compounds in dye laser systems, and as photochemical agents in the treatment of diseased tissues using photodynamic therapy techniques. The compounds include a tri-cyclic compound having the following structure: <IMAGE> Preferably R1-R5=R9-R12=C; R7=B; R6 and R8=N; R14=lower n-alkyl or an electron withdrawing group such as CN-; R16 and R19 are independently selected from the group consisting of lower n-alkyl, a sulfate or an acid or salt thereof, or hydrogen; and R20=R21=F. Other compounds include compounds of the formula <IMAGE> (a) <IMAGE> (b) <IMAGE> (c) <IMAGE> (d) <IMAGE> (e)

Inventors

  • 👤 Lee R. Morgan
  • 👤 Joseph H. Boyer

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-26 09:10
CPC Classifications
C; C09; C09B; C09B57/00; A; A61; A61K; A61K31/00; A61K31/69; A61K41/00; A61K41/0057; C07; C07F; C07F5/00; C07F5/02; C07F5/022; C09K; C09K11/00; C09K11/06

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 50 words
A compound selected from the group consisting of: (a) ##STR50## wherein R is H or lower alkyl; (b) ##STR51## wherein X is CH or N, Y is CH or N, and R is lower alkyl, where at least one of X and Y is N; and (c) α,α'-dipyridylmethane-BF 2 .
Claim 2
Dependent Claim 50 words
A compound selected from the group consisting of: (a) ##STR50## wherein R is H or lower alkyl; (b) ##STR51## wherein X is CH or N, Y is CH or N, and R is lower alkyl, where at least one of X and Y is N; and (c) α,α'-dipyridylmethane-BF 2 .
Claim 3
Dependent Claim 43 words
The compound of claim 1 wherein the compound is (a) ##STR52## wherein R is H or lower alkyl; or (b) ##STR53## wherein X is CH, Y is N, and R is lower alkyl, where at least one of X and Y is N.
Claim 4
Dependent Claim 10 words
The compound of claim 2 wherein the compound is 2(a).
Claim 5
Dependent Claim 10 words
The compound of claim 2 wherein the compound is 2(b).
Claim 6
Dependent Claim 38 words
An imidazomethene-BF 2 complex according to the formula ##STR54## wherein R 1 and R 4 are H or lower alkyl and R 2 and R 3 are CH 3 ; or R 1 -R 4 are lower alkyl.
Claim 7
Dependent Claim 38 words
An imidazomethene-BF 2 complex according to the formula ##STR54## wherein R 1 and R 4 are H or lower alkyl and R 2 and R 3 are CH 3 ; or R 1 -R 4 are lower alkyl.
Claim 8
Dependent Claim 12 words
The compound of claim 5 wherein the compound is tetramethyl-2,2'-biimidazole-BF 2 .

References Cited (Backward Citations)

EP0210351A2 Cited
WO1987004071A1 Cited
US4774339A Cited
US4799230A Cited
US5248782A Cited
US5338854A Cited
US5187288A Cited
US5274113A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1998-08-28 1999-02-27 1999-08-29 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 2002-08-28 2003-02-27 2003-08-29 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2006-08-28 2007-02-27 2007-08-29 $7700.00 Window Closed / Lapsed

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