US3845113A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulphonic acid group-containing compounds
Assignee: Bayer AG
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Filing: 1969-08-19
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Granted: 1974-10-29
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Expires: 1989-08-19
Abstract
Abstract 1. SULPHONIC ACID GROUP-CONTAINING COMPOUNDS WHICH CONTAIN 2 TO 10 RECURRENT STRUCTURAL UNITS OF THE FORMULA -((R2,(R1-O-)-PHENYLENE)-C(-R3)(-CH3)-(((M-O3S)N-)- PHENYLENE)-C(-R3)(-CH3))- IN WHICH R1 IS HYDROGEN, BENZYL, AN UNSUBSTITUTED ALKYL OF 1-4 CARBON ATOMS, OR AN ALKYL OF 1 TO 4 CARBON ATOMS SUBSTITUTED BY CARBOXY, CARBAMIDO, CHLORO, HYDROXY, OR SULPHONYL; R2 IS HYDROGEN, AN ALKYL OF 1-16 CARBON ATOMS, CYCLOHEXYL, BENZYL, PHENYLETHYL, PHENYL, CHLORO, OR BROMO; R3 IS HYDROGEN OR METHYL; N IS A NUMBER BETWEEN 0.7 AND 2; AND M IS HYDROGEN, AN ALKALI METAL OR ALKALINE EARTH METAL OR AMMONIUM.
Inventors
- 👤 K Walz
- 👤 W Hees
- 👤 M Quaedvlieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:03
CPC Classifications
D; D06; D06P; D06P1/00; D06P1/44; D06P1/62; D06P1/621; D06P1/622; D06P1/625; C; C07; C07C; C07C309/00; C07C59/00; C07C59/40; C07C59/58; C07C59/64; C07C59/66; C07C59/68; C07C59/70; Y; Y10; Y10S; Y10S534/00; Y10S534/01; Y10S8/00; Y10S8/916; Y10S8/917; Y10S8/92; Y10S8/922; Y10S8/924
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
15 words
SULPHONIC ACID GROUP-CONTAINING COMPOUNDS WHICH CONTAIN 2 TO 10 RECURRENT STRUCTURAL UNITS OF THE FORMULA
Claim 2
Dependent Claim
15 words
SULPHONIC ACID GROUP-CONTAINING COMPOUNDS WHICH CONTAIN 2 TO 10 RECURRENT STRUCTURAL UNITS OF THE FORMULA
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |