Patent US5557201A successfully refreshed from Google Patents.
Patent US4544727A successfully refreshed from Google Patents.
US4544727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of acrylonitrile, styrene, and para-isopropenylphenol
Assignee: Wakabayashi Patent Agency
•
Filing: 1984-07-30
•
Granted: 1985-10-01
•
Expires: 2004-07-30
Abstract
Abstract A copolymer consisting of 30 to 65 mole % of structural units of the formula ##STR1## 1 to 55 mole % of structural units of the formula ##STR2## and 10 to 60 mole % of structural units of the formula ##STR3## and having a number average molecular weight of 500 to 200,000.
Inventors
- 👤 Kenji Ema
- 👤 Jun Saito
- 👤 Takatoshi Mitsuishi
- 👤 Shuhei Ikado
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:50
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44; C08F212/00; C08F212/02; C08F212/04; C08F212/14; C08F212/22; C08F212/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
50 words
Copolymer consisting of 30 to 65 mole percent of structural units having the formula: ##STR7## 5to 45 mole percent of structural units having the formula: ##STR8## and 10 to 60 mole percent of structural units having the formula: ##STR9## and having a number average molecular weight of 500 to 200,000.
Claim 2
Dependent Claim
50 words
Copolymer consisting of 30 to 65 mole percent of structural units having the formula: ##STR7## 5to 45 mole percent of structural units having the formula: ##STR8## and 10 to 60 mole percent of structural units having the formula: ##STR9## and having a number average molecular weight of 500 to 200,000.
Claim 3
Dependent Claim
47 words
The copolymer as claimed in claim 1 which consists of 40 to 60 mole percent of the structural units of formula (I), 5 to 45 mole percent of the structural units of formula (II), and 15 to 60 mole percent of the structural units of formula (III).
Claim 4
Dependent Claim
18 words
The copolymer as claimed in claim 1 which has a number average molecular weight of 500 to 50,000.
Claim 5
Dependent Claim
18 words
The copolymer as claimed in claim 7 which has a number average molecular weight of 500 to 50,000.
Claim 6
Dependent Claim
69 words
The copolymer consisting of acrylonitrile units, styrene units and para-isopropenylphenol units, the mole percent of para-isopropenylphenol being in the range of 10 to 60 percent based upon the moles of the monomeric components, the minimum mole percent of styrene and acrylonitrile being 5 percent and 30 percent, respectively, based upon the moles of the monomeric compounds, and the number average molecular weight of the copolymer being 500 to 200,000.
Claim 7
Dependent Claim
69 words
The copolymer consisting of acrylonitrile units, styrene units and para-isopropenylphenol units, the mole percent of para-isopropenylphenol being in the range of 10 to 60 percent based upon the moles of the monomeric components, the minimum mole percent of styrene and acrylonitrile being 5 percent and 30 percent, respectively, based upon the moles of the monomeric compounds, and the number average molecular weight of the copolymer being 500 to 200,000.
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) | 1988-09-30 | 1989-04-01 | 1989-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-30 | 1993-04-01 | 1993-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-30 | 1997-04-01 | 1997-10-01 | $7700.00 | Window Closed / Lapsed |