Patent US2856370A successfully refreshed from Google Patents.
US2856370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for polymerizing cyclic ethers with phosphorous pentafluoride
Assignee: EIDP Inc
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Filing: 1953-09-09
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Granted: 1958-10-14
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Expires: 1973-09-09
Abstract
No abstract record available.
Inventors
- 👤 Earl L Muetterties
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:41
CPC Classifications
C; C08; C08G; C08G65/00; C08G65/02; C08G65/26; C08G65/2642; C08G65/2669; C08G65/2675
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A PROCESS FOR THE PREPARATION OF TETRAHYDROFURAN POLYMERS WHICH COMPRISES POLYMERIZING TETRAHYDROFURAN IN THE PRESENCE OF FROM 0.01 TO 45% BY WEIGHT OF PHOSPHORUS PENTAFLUORIDE POLYMERIZATION INITIATOR BASED ON THE WEIGHT OF THE CYCLIC ETHER.
Claim 2
Dependent Claim
35 words
A PROCESS FOR THE PREPARATION OF TETRAHYDROFURAN POLYMERS WHICH COMPRISES POLYMERIZING TETRAHYDROFURAN IN THE PRESENCE OF FROM 0.01 TO 45% BY WEIGHT OF PHOSPHORUS PENTAFLUORIDE POLYMERIZATION INITIATOR BASED ON THE WEIGHT OF THE CYCLIC ETHER.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-13 | 1962-04-14 | 1962-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-13 | 1966-04-14 | 1966-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-13 | 1970-04-14 | 1970-10-14 | $7700.00 | Window Closed / Lapsed |