US3718599A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilization of oxalate ester solutions during storage
Assignee: Wyeth Holdings LLC
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Filing: 1970-06-29
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Granted: 1973-02-27
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Expires: 1990-06-29
Abstract
Abstract This invention relates to a means and method for improving the storage stability of a chemiluminescent reaction component comprising an oxalic-type compound in a solvent, by adding a weak acid thereto, said reaction component being capable of providing chemiluminescent light on admixture with a hydroperoxide compound in the presence of a fluorescer.
Inventors
- 👤 M Rauhut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:38
CPC Classifications
C; C09; C09K; C09K11/00; C09K11/06; C09K11/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
12 words
A composition according to claim 1 wherein said acid is carbonic acid.
Claim 2
Dependent Claim
31 words
A composition according to claim 1, in which the alcohol which forms said ester is an alcohol characterized by an acid ionization constant in water greater than 1.3 X 10 10.
Claim 3
Dependent Claim
15 words
A composition according to claim 3 including in addition at least one organic fluorescent compound.
Claim 4
Dependent Claim
31 words
A composition according to claim 4, in which said alcohol is an aromatic alcohol substituted by a substituent characterized by a positive Hammett sigma value, and said fluorescent compound is rubrene.
Claim 5
Dependent Claim
20 words
A composition according to claim 5, in which said ester is a bis-ester of oxalic acid and a phenyl alcohol.
Claim 6
Dependent Claim
33 words
A composition according to claim 3 including at least an 0.005 M concentration of a quaternary ammonium or phosphonium salt which affects the rate of reaction of a hydroperoxide with an oxalic-type ester.
Claim 7
Dependent Claim
12 words
A process comprising reacting hydrogen peroxide with the composition of claim 4.
References Cited (Backward Citations)
DE902128C
Cited
DE1041770B
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |