Patent US2587533A successfully refreshed from Google Patents.
US2587533A
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Riboflavin-formaldehyde reaction product
Assignee: ENDO PRODUCTS Inc
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Filing: 1949-04-22
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Granted: 1952-02-26
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Expires: 1969-04-22
Abstract
No abstract record available.
Inventors
- 👤 Schoen Karl
- 👤 Samuel M Gordon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:54
CPC Classifications
A; A61; A61K; A61K31/00; A61K31/33; A61K31/395; A61K31/495; A61K31/505; A61K31/519; A61K31/525; C; C07; C07D; C07D475/00; C07D475/12; C07D475/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A METHYLOL DERIVATIVE OF RIBOFLAVIN WHEREIN AT LEAST ONE HYDROXYL OF THE RIBITYL GROUP IS REPLACED BY O(CH2O)NH, N BEING A POSITIVE INTEGER WHOSE MINIMUM VALUE IS ONE AND WHOSE MAXIMUM VALUE IS EIGHTEEN, THE MAXIMUM NUMBER OF CH2O GROUPS IN THE ENTIRE MOLECULE OF SAID DERIVATIVE BEING EIGHTEEN, SAID DERIVATIVE HAVING THE RING GROUP OF RIBOFLAVIN AND BEING SUBSTANTIALLY FREE FROM FORMALDEHYDE.
Claim 2
Dependent Claim
63 words
A METHYLOL DERIVATIVE OF RIBOFLAVIN WHEREIN AT LEAST ONE HYDROXYL OF THE RIBITYL GROUP IS REPLACED BY O(CH2O)NH, N BEING A POSITIVE INTEGER WHOSE MINIMUM VALUE IS ONE AND WHOSE MAXIMUM VALUE IS EIGHTEEN, THE MAXIMUM NUMBER OF CH2O GROUPS IN THE ENTIRE MOLECULE OF SAID DERIVATIVE BEING EIGHTEEN, SAID DERIVATIVE HAVING THE RING GROUP OF RIBOFLAVIN AND BEING SUBSTANTIALLY FREE FROM FORMALDEHYDE.
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) | 1955-02-25 | 1955-08-27 | 1956-02-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-25 | 1959-08-27 | 1960-02-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-25 | 1963-08-27 | 1964-02-26 | $7700.00 | Window Closed / Lapsed |