Patent US2579433A successfully refreshed from Google Patents.
US2579433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing olefins
Assignee: California Research LLC
•
Filing: 1948-05-25
•
Granted: 1951-12-18
•
Expires: 1968-05-25
Abstract
No abstract record available.
Inventors
- 👤 Melvin M Holm
- 👤 Gordon E Langlois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:25
CPC Classifications
C; C07; C07C; C07C2/00; C07C2/02; C07C2/04; C07C2/06; C07C2/08; C07C2/14; C07C2/18; C07C2521/00; C07C2521/06; C07C2521/08; C07C2527/00; C07C2527/14; C07C2527/16; C07C2527/167; C07C2527/173; Y; Y10; Y10S; Y10S585/00; Y10S585/949; Y10S585/95
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
IN A PROCESS FOR POLYMERIZING OLEFINIC HYDROCARBONS WHEREIN IN OLEFIN-CONTAINING MATERIAL IS CONTACTED WITH A PHOSPHORIC ACID FILM CATALYST, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID OELFIN-CONTAINING MATERIAL WITH A CATALYST CONSISING OF NON-PORUS, INERT, SOLID PARTICLES HAVING AN AVERAGE DIAMTER NOT GREATER THAN THAT OF 28-35 MESH PARTICLES AND HAVING A THIN FILM OF CONCENTRATED PHOSPHORIC ACID DISPOSED ON THE SURFACES OF SAID PARTICLES.
Claim 2
Dependent Claim
64 words
IN A PROCESS FOR POLYMERIZING OLEFINIC HYDROCARBONS WHEREIN IN OLEFIN-CONTAINING MATERIAL IS CONTACTED WITH A PHOSPHORIC ACID FILM CATALYST, THE IMPROVEMENT WHICH COMPRISES CONTACTING SAID OELFIN-CONTAINING MATERIAL WITH A CATALYST CONSISING OF NON-PORUS, INERT, SOLID PARTICLES HAVING AN AVERAGE DIAMTER NOT GREATER THAN THAT OF 28-35 MESH PARTICLES AND HAVING A THIN FILM OF CONCENTRATED PHOSPHORIC ACID DISPOSED ON THE SURFACES OF SAID PARTICLES.
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) | 1954-12-17 | 1955-06-18 | 1955-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-17 | 1959-06-18 | 1959-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-17 | 1963-06-18 | 1963-12-18 | $7700.00 | Window Closed / Lapsed |