Patent US3928293A successfully refreshed from Google Patents.
US3928293A
Expired / Lapsed
US
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Polymeric reagent
Assignee: Dynapol Shareholders Liquidating Trust
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Filing: 1974-04-01
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Granted: 1975-12-23
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Expires: 1994-04-01
Abstract
Abstract Complexes of boron trihydride with solid particulate insoluble cross-linked thiohydrocarbon polymers are disclosed. The materials are useful in organic reduction and hydroboration reactions, and in these uses offer handling conveniences over existing forms of boron trihydride.
Inventors
- 👤 Guy A Crosby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:14
CPC Classifications
C; C08; C08G; C08G79/00; C08G79/08; C08F; C08F8/00; C08F8/34; C08F8/42; C08G75/00; C08G75/02; C08G75/0204; C08G75/0286; C08G75/0295; F; F17; F17C; F17C11/00; F17C11/005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
43 words
A POLYMERIC BORON HYDRIDE REAGENT COMPRISING A PARTICULTE, SOLID, CROSS-LINK ALIPHATIC, CYCLOALIPHATIC, OR AROMATIC ORGANIC POLYMER CONTAINING A SUBSTANTIAL PLURALITY OF SULFUR ATOMS IN A THIOETHER CONFIGURATION AND, IN COMPLEX COMBINA TION WITH A MAJOR PROPORTION OF SAID SULFUR ATOMS, BORON HYDRIDE MOLECULES.
Claim 2
Dependent Claim
43 words
A POLYMERIC BORON HYDRIDE REAGENT COMPRISING A PARTICULTE, SOLID, CROSS-LINK ALIPHATIC, CYCLOALIPHATIC, OR AROMATIC ORGANIC POLYMER CONTAINING A SUBSTANTIAL PLURALITY OF SULFUR ATOMS IN A THIOETHER CONFIGURATION AND, IN COMPLEX COMBINA TION WITH A MAJOR PROPORTION OF SAID SULFUR ATOMS, BORON HYDRIDE MOLECULES.
Claim 3
Dependent Claim
39 words
The polymeric boron hydride reagent of claim 1, wherein the polymer contains not less than one sulfur atom for each 30 carbon atoms and has at least 80% of its sulfur atoms in complex combination with boron hydride molecules.
Claim 4
Dependent Claim
26 words
The polymeric boron hydride reagent of claim 2, wherein the polymer is further characterized as a cross-linked polystyrene having sulfur atoms pendant from its aromatic rings.
Claim 5
Dependent Claim
16 words
The polymeric boron hydride reagent of claim 2, comprising repeating units of the general structural formula
Claim 6
Dependent Claim
15 words
The polymeric boron hydride reagent of claim 2, comprising repeating styrene units of the formula
Claim 7
Dependent Claim
22 words
The reagent of claim 5, wherein X and X'' are each independently selected from the group of methyl, ethyl, n-propyl, and isopropyl.
Claim 8
Dependent Claim
13 words
The reagent of claim 5, wherein X and X'' are each methyl groups.
Claim 9
Dependent Claim
15 words
The polymeric boron hydride reagent of claim 2, comprising repeating styrene units of the formula
Claim 10
Dependent Claim
9 words
The reagent of claim 8, wherein X'' is methyl.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |