Patent US3132187A successfully refreshed from Google Patents.
US3132187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing perylene
Assignee: —
•
Filing: —
•
Granted: 1964-05-05
•
Expires: 1981-05-05
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:59
CPC Classifications
C; C07; C07C; C07C1/00; C07C1/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
A PROCESS FOR THE PREPARATION OF PERYLENE WHICH COMPRISES THE STEPS OF MIXING DRY PERYLENE TETRACARBOXYLIC ACID AND DRY SODA LIME, HEATING SAID DRY MIXTURE AT A TEMPERATURE IN THE RANGE OF FROM 350* TO ABOUT 400*C. UNDER SUB-ATMOSPHERIC PRESSURE CONDITIONS IN THE RANGE OF FROM ABOUT 1 TO ABOUT 3 MM. MERCURY TO PROVIDE PERPYLENE EFFLUENT VAPOR AND CONDENSING SAID VAPOR WHEREBY PERYLENE HAVING A RELATIVELY HIGH PURITY IS OBTAINED.
Claim 2
Dependent Claim
71 words
A PROCESS FOR THE PREPARATION OF PERYLENE WHICH COMPRISES THE STEPS OF MIXING DRY PERYLENE TETRACARBOXYLIC ACID AND DRY SODA LIME, HEATING SAID DRY MIXTURE AT A TEMPERATURE IN THE RANGE OF FROM 350* TO ABOUT 400*C. UNDER SUB-ATMOSPHERIC PRESSURE CONDITIONS IN THE RANGE OF FROM ABOUT 1 TO ABOUT 3 MM. MERCURY TO PROVIDE PERPYLENE EFFLUENT VAPOR AND CONDENSING SAID VAPOR WHEREBY PERYLENE HAVING A RELATIVELY HIGH PURITY IS OBTAINED.
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) | 1967-05-05 | 1967-11-04 | 1968-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-05-05 | 1971-11-04 | 1972-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-05-05 | 1975-11-04 | 1976-05-05 | $7700.00 | Window Closed / Lapsed |