US2980741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Di-valent nickel acetylene reactions
Assignee: Monsanto Chemicals Ltd
•
Filing: 1959-07-08
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Granted: 1961-04-18
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Expires: 1979-07-08
Abstract
No abstract record available.
Inventors
- 👤 Harold H Zeiss
- 👤 Tsutsui Minoru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:57
CPC Classifications
C; C07; C07F; C07F15/00; C07F15/04; C07C; C07C13/00; C07C13/28; C07C2/00; C07C2/02; C07C2/42; C07C2/48; C07C2531/00; C07C2531/02; C07C2531/12; C07C2601/00; C07C2601/12; C07C2601/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
23 words
THE PROCESS OF PREPARING HEXAPHENYL BENZENE AND TETRAPHENYLDIHYDROBENZENE WHICH COMPRISES CONTACTING DIPHENYLACETYLENE WITH DIETHYLNICKEL IN TETRAHYDROFURAN TO EFFECT CONDENSATION TO HEXAPHENYLBENZENE AND TETRAPHENYLDIHYDROBENZENE.
Claim 2
Dependent Claim
4 words
AS A COMPOUND, 1,2,3,4-TETRAPHENYL-1,3-CYCLOHEXADIENE.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-04-17 | 1964-10-17 | 1965-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-17 | 1968-10-17 | 1969-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-17 | 1972-10-17 | 1973-04-18 | $7700.00 | Window Closed / Lapsed |