Patent US5792389A successfully refreshed from Google Patents.
US5792389A
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Water soluble laser dyes
Assignee: United States Enrichment Corp
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Filing: 1993-10-27
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Granted: 1998-08-11
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Expires: 2013-10-27
Abstract
Abstract Novel water soluble dyes of the formula I are provided <IMAGE> (I) wherein R1 and R4 are alkyl of 1 to 4 carbon atoms or hydrogen; or R1-R2 or R2-R4 form part of aliphatic heterocyclic rings; R2 is hydrogen or joined with R1 or R4 as described above; R3 is -(CH2)m-SO3-, where m is 1 to 6; X is N, CH or <IMAGE> where Y is 2 -SO3-; Z is 3, 4, 5 or 6 -SO3-. The novel dyes are particularly useful as the active media in water solution dye lasers.
Inventors
- 👤 Peter R. Hammond
- 👤 James F. Feeman
- 👤 George F. Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:27
CPC Classifications
C; C07; C07D; C07D491/00; C07D491/12; C07D491/14; C07D311/00; C07D311/02; C07D311/78; C07D311/80; C07D311/82; C09; C09B; C09B11/00; C09B11/04; C09B11/26; C09B19/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
77 words
A composition of matter having the formula I: ##STR12## wherein: R 1 and R 4 are alkyl of 1 to 4 carbon atoms or hydrogen; or R 1 -R 2 or R 2 -R 4 form part of aliphatic heterocyclic rings; R 2 is hydrogen or joined with R 1 or R 4 as described above; R 3 is --(CH 2 ) m --SO 3 - ; where m is 1 to 6; and X is CH.
Claim 2
Dependent Claim
77 words
A composition of matter having the formula I: ##STR12## wherein: R 1 and R 4 are alkyl of 1 to 4 carbon atoms or hydrogen; or R 1 -R 2 or R 2 -R 4 form part of aliphatic heterocyclic rings; R 2 is hydrogen or joined with R 1 or R 4 as described above; R 3 is --(CH 2 ) m --SO 3 - ; where m is 1 to 6; and X is CH.
Claim 3
Dependent Claim
20 words
The composition of claim 1 wherein m is 2 and R 1 -R 2 is --(CH 2 ) 3 --.
Claim 4
Dependent Claim
76 words
A composition of matter having the formula I: ##STR13## wherein: R 1 and R 4 are alkyl of 1 to 4 carbon atoms or hydrogen; or R 1 -R 2 or R 2 -R 4 form part of aliphatic heterocyclic rings; R 2 is hydrogen or joined with R 1 or R 4 as described above; R 3 is --(CH 2 ) m --SO 3 - ; where m is 1 to 6; X is nitrogen.
Claim 5
Dependent Claim
76 words
A composition of matter having the formula I: ##STR13## wherein: R 1 and R 4 are alkyl of 1 to 4 carbon atoms or hydrogen; or R 1 -R 2 or R 2 -R 4 form part of aliphatic heterocyclic rings; R 2 is hydrogen or joined with R 1 or R 4 as described above; R 3 is --(CH 2 ) m --SO 3 - ; where m is 1 to 6; X is nitrogen.
Claim 6
Dependent Claim
20 words
The composition of claim 3 wherein m is 2 and R 1 -R 2 is --(CH 2 ) 3 --.
Claim 7
Dependent Claim
78 words
A composition of matter having the formula I: ##STR14## wherein R 1 -R 2 are joined in a ring of the form --(CH 2 ).sub.(2 or 3) --; R 4 =H; R 3 is --(CH 2 ) m --SO 3 - , where m is 1 to 6; X is N, CH or ##STR15## wherein Y is --SO 3 - at position 2 of the ring; and Z is --SO 3 - at position 4 of the ring.
Claim 8
Dependent Claim
78 words
A composition of matter having the formula I: ##STR14## wherein R 1 -R 2 are joined in a ring of the form --(CH 2 ).sub.(2 or 3) --; R 4 =H; R 3 is --(CH 2 ) m --SO 3 - , where m is 1 to 6; X is N, CH or ##STR15## wherein Y is --SO 3 - at position 2 of the ring; and Z is --SO 3 - at position 4 of the ring.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-08-10 | 2002-02-09 | 2002-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-10 | 2006-02-09 | 2006-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-10 | 2010-02-09 | 2010-08-11 | $7700.00 | Window Closed / Lapsed |