US2749313A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning polymerization reactors
Assignee: Polysar Ltd
•
Filing: 1952-06-30
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Granted: 1956-06-05
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Expires: 1972-06-30
Abstract
No abstract record available.
Inventors
- 👤 Williams Harry Leverne
- 👤 Davidson Melvin John George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:24
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/008; C08F36/00; Y; Y10; Y10S; Y10S526/00; Y10S526/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
A METHOD OF REMOVING FROM A PROCESS EQUIPMENT POLYMERS COMPRISING BUTADIENE-1,3 WHICH ARE SO HIGHLY CROSSLINKED THAT THE MAJOR PROPORTION OF SAID POLYMER IS INSOLUBLE IN SUBSTANCES WHICH ARE SOLVENTS FOR SAID POLYMER WHEN SAID POLYMER IS NOT CROSS-LINKED, WHICH COMPRISES AGITATING SUCH EQUIPMENT A COMPOSITION COMPRISING A LARGE PROPORTION OF A SOLVENT FOR BUTADIENE-1,3 COMPRISING POLYMERS AND A SMALL PROPORTION OF AN ORGANIC HYDROPEROXIDE, UNTIL THE MAJOR PROPORTION OF THE POLYMER IS DEGRADED AND IS DISSOLVED OR SUSPENDED IN THE COMPOSITION.
Claim 2
Independent Claim
82 words
A METHOD OF REMOVING FROM A PROCESS EQUIPMENT POLYMERS COMPRISING BUTADIENE-1,3 WHICH ARE SO HIGHLY CROSSLINKED THAT THE MAJOR PROPORTION OF SAID POLYMER IS INSOLUBLE IN SUBSTANCES WHICH ARE SOLVENTS FOR SAID POLYMER WHEN SAID POLYMER IS NOT CROSS-LINKED, WHICH COMPRISES AGITATING SUCH EQUIPMENT A COMPOSITION COMPRISING A LARGE PROPORTION OF A SOLVENT FOR BUTADIENE-1,3 COMPRISING POLYMERS AND A SMALL PROPORTION OF AN ORGANIC HYDROPEROXIDE, UNTIL THE MAJOR PROPORTION OF THE POLYMER IS DEGRADED AND IS DISSOLVED OR SUSPENDED IN THE COMPOSITION.
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) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |