US2900388A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acyl hydrazine derivatives of bis(4-dimethylaminophenyl) methane and process
Assignee: Individual
•
Filing: 1957-08-08
•
Granted: 1959-08-18
•
Expires: 1977-08-08
Abstract
No abstract record available.
Inventors
- 👤 Jack M Tien
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:52
CPC Classifications
C; C07; C07D; C07D213/00; C07D213/02; C07D213/04; C07D213/60; C07D213/78; C07D213/86; C07C; C07C243/00; Y; Y10; Y10S; Y10S252/00; Y10S252/961; Y10S252/962
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
A COMPOUND HAVING THE STRUCTURAL FORMULA
Claim 2
Dependent Claim
6 words
A COMPOUND HAVING THE STRUCTURAL FORMULA
References Cited (Backward Citations)
DE116566C
Cited
DE106721C
Cited
DE116352C
Cited
GB729348A
Cited
US2714595A
Cited
US2746968A
Cited
US2810725A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-17 | 1963-02-16 | 1963-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-17 | 1967-02-16 | 1967-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-17 | 1971-02-16 | 1971-08-18 | $7700.00 | Window Closed / Lapsed |