US4880466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ink formulation for monitoring sterilization processes
Assignee: Surgicot Inc
•
Filing: 1988-06-09
•
Granted: 1989-11-14
•
Expires: 2008-06-09
Abstract
Abstract In accordance with the present invention an ink formulation capable of monitoring steam, dry heat and ethylene oxide gas sterilization processes is disclosed. The formulation comprises selected substituted pyridenes, quinolines or isoquinolines as the active compound in combination with a nitrocellulose solution and a solvent.
Inventors
- 👤 Andrew A. Zwarun
- 👤 Gail L. Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:30
CPC Classifications
C; C09; C09D; C09D11/00; C09D11/50
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
141 words
In an ink formulation for monitoring a steam sterilization process, said formulation comprising an active compound selected from the group consisting of ##STR3## and salts thereof, wherein R 1 and R 2 are independently selected from the group consisting of hydrogen, ##STR4## with the proviso that at least one, but not more than two of R 1 and R 2 are hydrogen; R is hydrogen, halogen or alkyl; X is hydrogen, --N═O, --NO 2 , --OH, --SH, --CH═N--OH, alkyl or halogen; Y is hydrogen, --N═O, --OH, --SH, --CH═N--OH, alkyl or halogen, Z is oxygen or sulfur; R 3 is --OH, --NH 2 , --NH--NH 2 or alkoxy; at least one of the R 4 groups is --OH, --SH or --CH═N--OH, and the other R 4 groups are hydrogen; the improvement wherein said ink further comprises a nitrocellulose solution and a solvent.
Claim 2
Dependent Claim
141 words
In an ink formulation for monitoring a steam sterilization process, said formulation comprising an active compound selected from the group consisting of ##STR3## and salts thereof, wherein R 1 and R 2 are independently selected from the group consisting of hydrogen, ##STR4## with the proviso that at least one, but not more than two of R 1 and R 2 are hydrogen; R is hydrogen, halogen or alkyl; X is hydrogen, --N═O, --NO 2 , --OH, --SH, --CH═N--OH, alkyl or halogen; Y is hydrogen, --N═O, --OH, --SH, --CH═N--OH, alkyl or halogen, Z is oxygen or sulfur; R 3 is --OH, --NH 2 , --NH--NH 2 or alkoxy; at least one of the R 4 groups is --OH, --SH or --CH═N--OH, and the other R 4 groups are hydrogen; the improvement wherein said ink further comprises a nitrocellulose solution and a solvent.
Claim 3
Dependent Claim
24 words
The ink of claim 1 wherein said active compound is selected from the group consisting of 1,2-bis-(4-pyridyl)-ethylene, 1,2-bis-(4-pyridyl)-ethane, benzyl pyridine, 5-hydroxy isoquinoline, and 3-pyridylcarbinol.
Claim 4
Dependent Claim
11 words
The ink of claim 2 wherein said active compound is 1,2-bis-(4-pyridyl)-ethylene.
Claim 5
Dependent Claim
22 words
The ink of claim 1 wherein said solvent is selected from the group consisting of ethyl acetate, acetone, thanol, and methylethyl ketone.
Claim 6
Dependent Claim
11 words
The ink of claim 4 wherein said solvent is ethyl acetate.
Claim 7
Dependent Claim
33 words
The ink of claim 1 wherein the active compound is in solution with a second solvent in a weight ratio of between about 1:7 and 1:10 of the compound to the second solvent.
Claim 8
Dependent Claim
37 words
The ink of claim 6 comprising between about 20 and 80 volume percent of nitrocellulose solution, between about 5 and 60 volume percent of active compound solution and between about 10 and 75 volume percent of solvent.
Claim 9
Dependent Claim
37 words
The ink of claim 6 comprising between about 40 and 60 volume percent of nitrocellulose solution, between about 10 and 20 volume percent of active compound solution and between about 45 and 50 volume percent of solvent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |