Patent US2944081A successfully refreshed from Google Patents.
US2944081A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diphenyl alkylenediamines and methods of preparing the same
Assignee: Wyeth Holdings LLC
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Filing: 1958-03-14
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Granted: 1960-07-05
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Expires: 1978-03-14
Abstract
No abstract record available.
Inventors
- 👤 Jr William Blythe Wright
- 👤 Jr Robert Allis Hardy
- 👤 Brabander Herbert Joseph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:47
CPC Classifications
C; C07; C07C; C07C233/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
12 words
A COMPOUND OF THE GROUP CONSISTING OF THOSE HAVING THE GENERAL FORMULA:
Claim 2
Dependent Claim
12 words
A COMPOUND OF THE GROUP CONSISTING OF THOSE HAVING THE GENERAL FORMULA:
References Cited (Backward Citations)
US1534525A
Cited
US1926015A
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US2654758A
Cited
US2670373A
Cited
US2670374A
Cited
US2746992A
Cited
US2851466A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-05 | 1964-01-04 | 1964-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-05 | 1968-01-04 | 1968-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-05 | 1972-01-04 | 1972-07-05 | $7700.00 | Window Closed / Lapsed |