US2790802A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Substituted tetrahydropteridines and method of preparing the same
Assignee: Wyeth Holdings LLC
•
Filing: 1954-05-06
•
Granted: 1957-04-30
•
Expires: 1974-05-06
Abstract
No abstract record available.
Inventors
- 👤 Jr John A Brockman
- 👤 Marvin J Fahrenbach
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 01:52
CPC Classifications
C; C07; C07D; C07D475/00; C07D475/02; C07D475/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
11 words
COMPOUNDS OF THE GROUP CONSISTING OF THOSE HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
11 words
COMPOUNDS OF THE GROUP CONSISTING OF THOSE HAVING THE GENERAL FORMULA:
Claim 3
Independent Claim
9 words
A METHOD OF PREPARING COMPOUNDS HAVING THE GENERAL FORMULA:
Claim 4
Independent Claim
9 words
A METHOD OF PREPARING COMPOUNDS HAVING THE GENERAL 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) | 1960-04-29 | 1960-10-29 | 1961-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-29 | 1964-10-29 | 1965-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-29 | 1968-10-29 | 1969-04-30 | $7700.00 | Window Closed / Lapsed |