US3169143A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of 2-aminoethyl hydrogen sulfate
Assignee: Richardson Co
•
Filing: 1961-10-30
•
Granted: 1965-02-09
•
Expires: 1981-10-30
Abstract
No abstract record available.
Inventors
- 👤 Gavlin Gilbert
- 👤 Hoattori Kiyoshi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:03
CPC Classifications
C; C07; C07C; C07C305/00; C07C305/02; C07C305/04; C07C305/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2088027A
Cited
US2187244A
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GB581539A
Cited
US2697031A
Cited
US2921085A
Cited
US2966518A
Cited
US2923728A
Cited
US3079416A
Cited
US3037042A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-02-09 | 1968-08-10 | 1969-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-02-09 | 1972-08-10 | 1973-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-02-09 | 1976-08-10 | 1977-02-09 | $7700.00 | Window Closed / Lapsed |