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Patent US2909527A successfully refreshed from Google Patents.
US2909527A
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US
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N, n'-substituted-bis-(3-oxypyridyl) betaines and their preparation
Assignee: US Vitamin and Pharmaceutical Corp
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Filing: 1956-09-06
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Granted: 1959-10-20
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Expires: 1976-09-06
Abstract
No abstract record available.
Inventors
- 👤 Seymour L Shapiro
- 👤 Freedman Louis
- 👤 Weinberg Kurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:54
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/62; C07D213/63; C07D213/65
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
14 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A FREE BETAINE OF THE FORMULA
Claim 2
Dependent Claim
14 words
A COMPOUND SELECTED FROM THE GROUP CONSISTING OF A FREE BETAINE OF THE FORMULA
References Cited (Backward Citations)
US2728775A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-19 | 1963-04-20 | 1963-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-19 | 1967-04-20 | 1967-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-19 | 1971-04-20 | 1971-10-20 | $7700.00 | Window Closed / Lapsed |