Patent US3873551A successfully refreshed from Google Patents.
US3873551A
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4-acetoxy-4{40 -sulfoxydiphenyl-(2-pyridyl)methane and sodium salt thereof
Assignee: Prodotti Antibiotici SpA
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Filing: 1973-05-16
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Granted: 1975-03-25
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Expires: 1993-05-16
Abstract
Abstract There are provided new esters of diphenolic substances with polybasic inorganic acids, these esters having the general formula: WHEREIN R1 is a hydrogen atom or a lower alkyl radical, R2 is a lower alkyl radical or a heterocyclic radical or R1 and R2, together with the carbon atom to which they are attached, form a saturated or unsaturated carbocyclic or heterocyclic radical, R3 is the residue of a polybasic inorganic acid and R4 is a hydrogen atom, an acyl radical or the residue of a polybasic inorganic acid, with the proviso that R4 is not a sulpho radical when R3 is a sulpho radical and REPRESENTS AN ISOPROPYLIDENE, 2-PICOLYLIDENE OR 3PHTHALIDYLIDENE RADICAL; AND THE NON-TOXIC SALTS THEREOF.
Inventors
- 👤 Tiberio Bruzzese
- 👤 Giuseppe Ghielmetti
- 👤 Rodolfo Ferrari
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:23
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/38; C07F9/40; C07F9/4071; C07F9/4084; C07D; C07D209/00; C07D209/02; C07D209/04; C07D209/30; C07D209/32; C07D209/34; C07F9/06; C07F9/08; C07F9/09; C07F9/12; C07F9/547; C07F9/553; C07F9/572; C07F9/5728; C07F9/576; C07F9/58
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
1 words
4-ACETOXY-4''-SULPHOXYDIPHENYL-(2-PYRIDYL)-METHANE.
Claim 2
Dependent Claim
1 words
4-ACETOXY-4''-SULPHOXYDIPHENYL-(2-PYRIDYL)-METHANE.
Claim 3
Dependent Claim
4 words
Monosodium salt of 4-acetoxy-4''-sulphoxydiphenyl-(2-pyridyl)-methane.
Claim 4
Dependent Claim
4 words
Monosodium salt of 4-acetoxy-4''-sulphoxydiphenyl-(2-pyridyl)-methane.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |