Patent US2829137A successfully refreshed from Google Patents.
US2829137A
Expired / Lapsed
US
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Polyalkylenepolyphosphinic acids
Assignee: EIDP Inc
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Filing: 1955-11-14
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Granted: 1958-04-01
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Expires: 1975-11-14
Abstract
No abstract record available.
Inventors
- 👤 Yolles Seymour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:10
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/40
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
THE PROCESS WHICH COMPRISES REACTING A LOWER MONOOLEFIN HYDROCARBON POLYMER WHEREIN THE REPEATING OLEFINIC UNITS HAVE 2 TO 4 CARBON ATOMS, WITH AN OXYGEN CONTAINING GAS, AND A HYDROCARBYLPHOSPHONOUS DICHLORIDE AT 40* C. TO 135* C.
Claim 2
Dependent Claim
36 words
THE PROCESS WHICH COMPRISES REACTING A LOWER MONOOLEFIN HYDROCARBON POLYMER WHEREIN THE REPEATING OLEFINIC UNITS HAVE 2 TO 4 CARBON ATOMS, WITH AN OXYGEN CONTAINING GAS, AND A HYDROCARBYLPHOSPHONOUS DICHLORIDE AT 40* C. TO 135* C.
References Cited (Backward Citations)
US2671080A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-31 | 1961-09-30 | 1962-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-31 | 1965-09-30 | 1966-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-31 | 1969-09-30 | 1970-04-01 | $7700.00 | Window Closed / Lapsed |