US2835712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of calcium compounds of cyclopentadiene and its alkylated, aralkylated, and arylated derivatives
Assignee: ZIEGLER AG
•
Filing: 1955-07-11
•
Granted: 1958-05-20
•
Expires: 1975-07-11
Abstract
No abstract record available.
Inventors
- 👤 Ziegler Karl
- 👤 Hafner Klaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:47
CPC Classifications
C; C07; C07F; C07F3/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
PROCESS FOR THE PRODUCTION OF CALCIUM COMPOUNDS OF CYCLOPENTADIENE AND ITS ALKYLATED, ARALKYLATED AND ARYLATED DERIVATIVES, WHICH COMPRISES REACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CYCLOPENTADIENE, DICYCLOPENTADIENE AND ITS ALKYL, ARALKYL, AND ARYL DERIVATIVES WITH CALCIUM CARBIDE AT ELEVATED TEMPERATURES IN THE PRESENCE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ANHYDROUS AMMONIA AND ANHYDROUS MATERIALS HAVING A STRONG BASIC REACTION AND CONTAINING ANHYDROUS NH2 GROUPS.
Claim 2
Dependent Claim
69 words
PROCESS FOR THE PRODUCTION OF CALCIUM COMPOUNDS OF CYCLOPENTADIENE AND ITS ALKYLATED, ARALKYLATED AND ARYLATED DERIVATIVES, WHICH COMPRISES REACTING A COMPOUND SELECTED FROM THE GROUP CONSISTING OF CYCLOPENTADIENE, DICYCLOPENTADIENE AND ITS ALKYL, ARALKYL, AND ARYL DERIVATIVES WITH CALCIUM CARBIDE AT ELEVATED TEMPERATURES IN THE PRESENCE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF ANHYDROUS AMMONIA AND ANHYDROUS MATERIALS HAVING A STRONG BASIC REACTION AND CONTAINING ANHYDROUS NH2 GROUPS.
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) | 1961-05-19 | 1961-11-18 | 1962-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-05-19 | 1965-11-18 | 1966-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-05-19 | 1969-11-18 | 1970-05-20 | $7700.00 | Window Closed / Lapsed |