US4950771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dihydroxy compound
Assignee: Mitsubishi Gas Chemical Co Inc
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Filing: 1989-05-19
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Granted: 1990-08-21
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Expires: 2009-05-19
Abstract
Abstract This invention provides 3,9-bis[1,1-dimethyl-2-(4'-hydroxybenzoyloxy)ethyl]-2,4,8,10-tetraoxaspiro[5,5]-undecane represented by the formula: ##STR1## a process for preparing the above compound by a transesterification reaction of 3,9-bis(1,1-dimethyl-2-hydroxyethyl)-2,4,8,10-tetraoxaspiro[5,5]undecane with alkyl 4-hydroxybenzoate.
Inventors
- 👤 Mitsuhito Masumoto
- 👤 Toshiaki Asoh
- 👤 Youichirou Ezaki
- 👤 Hiroshi Aibe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:19
CPC Classifications
C; C07; C07D; C07D493/00; C07D493/02; C07D493/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
6 words
3,9-bis[1,1-dimethyl-2-(4'-hydroxybenzoyloxy)ethyl]-2,4,8,10-tetraoxaspiro[5,5]undecane represented by the formula: ##STR4##
Claim 2
Dependent Claim
6 words
3,9-bis[1,1-dimethyl-2-(4'-hydroxybenzoyloxy)ethyl]-2,4,8,10-tetraoxaspiro[5,5]undecane represented by the formula: ##STR4##
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) | 1993-08-20 | 1994-02-19 | 1994-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-08-20 | 1998-02-19 | 1998-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-08-20 | 2002-02-19 | 2002-08-21 | $7700.00 | Window Closed / Lapsed |