US3330868A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making phosphonium methylene phosphoranes
Assignee: Monsanto Research Corp
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Filing: 1963-10-14
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Granted: 1967-07-11
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Expires: 1983-10-14
Abstract
No abstract record available.
Inventors
- 👤 Jr Daniel W Grisley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:07
CPC Classifications
C; C07; C07F; C07F9/00; C07F9/02; C07F9/28; C07F9/54; C07F9/5449
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
THE METHOD OF PRODUCING A PHOSPHONIUM METHYLENEPHOSPHORANE HALIDE WHICH COMPRISES PASSING A SOLUTION OF A MIXTURE OF AN ALKYLPHOSPHONIUM HALIDE AND A METHYLENE DIPHOSPHONIUM DIHALIDE INTO A BED OF A SOLID BASIC CHROMATOGRAPHIC ADSORBENT AND ELUTING THE ADSORBENT BED.
Claim 2
Independent Claim
39 words
THE METHOD OF PRODUCING A PHOSPHONIUM METHYLENEPHOSPHORANE HALIDE WHICH COMPRISES PASSING A SOLUTION OF A MIXTURE OF AN ALKYLPHOSPHONIUM HALIDE AND A METHYLENE DIPHOSPHONIUM DIHALIDE INTO A BED OF A SOLID BASIC CHROMATOGRAPHIC ADSORBENT AND ELUTING THE ADSORBENT BED.
References Cited (Backward Citations)
US3262971A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-10 | 1971-01-09 | 1971-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-10 | 1975-01-09 | 1975-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-10 | 1979-01-09 | 1979-07-11 | $7700.00 | Window Closed / Lapsed |