US2695310A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of guanidinium mercaptoalkanesulfonate
Assignee: Lever Brothers Co
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Filing: 1951-12-12
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Granted: 1954-11-23
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Expires: 1971-12-12
Abstract
No abstract record available.
Inventors
- 👤 Charles H Schramm
- 👤 Roy H Karlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:50
CPC Classifications
C; C07; C07D; C07D339/00; C07D339/02; C07D339/04; C07C; C07C303/00; C07C303/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A PROCESS FOR THE PREPARATION OF S-THIURONIUM ALKANESULFONATE WHICH COMPRISES REACTING AN ALKYLENE DIHALIDE WITH AN ALKALI METAL SULFITE AT AN ELEVATED TEMPERATURE, REMOVING UNREACTED DIHALIDES, ADDING THIOUREA, HEATING UNTIL SOLUTION IS EFFECTED, ALLOWING THE REACTION MIXTURE TO STAND, AND RECOVERING A CRYSTALLINE PRECIPITATE OF SAID S-THIURONIUM ALKANESULFONATE.
Claim 2
Dependent Claim
48 words
A PROCESS FOR THE PREPARATION OF S-THIURONIUM ALKANESULFONATE WHICH COMPRISES REACTING AN ALKYLENE DIHALIDE WITH AN ALKALI METAL SULFITE AT AN ELEVATED TEMPERATURE, REMOVING UNREACTED DIHALIDES, ADDING THIOUREA, HEATING UNTIL SOLUTION IS EFFECTED, ALLOWING THE REACTION MIXTURE TO STAND, AND RECOVERING A CRYSTALLINE PRECIPITATE OF SAID S-THIURONIUM ALKANESULFONATE.
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) | 1957-11-22 | 1958-05-24 | 1958-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-11-22 | 1962-05-24 | 1962-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-11-22 | 1966-05-24 | 1966-11-23 | $7700.00 | Window Closed / Lapsed |