US3957701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aminoplast moulding materials with cured aminoplast filler
Assignee: British Industrial Plastics Ltd
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Filing: 1974-08-27
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Granted: 1976-05-18
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Expires: 1994-08-27
Abstract
Abstract Aminoplastic moulding compositions include a filler which comprises or consists of a cured, particulate aminoplast material having a water absorption (absorbency) of at least 2.0 millilitres of water per gram; the aminoplast filler material preferably is a hydrophilic urea-formaldehyde foam, which has been disintegrated, or a particulate urea-formaldehyde material precipitated from a solution containing a wetting agent.
Inventors
- 👤 Nigel A. Cutler
- 👤 Michael L. Bradley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:18
CPC Classifications
C; C08; C08L; C08L61/00; C08L61/20
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A thermosetting moulding composition including an amino-formaldehyde resin and a filler composed of α-cellulose dispersed therein, at least about 30% by weight of said filler replaced by an unfilled amino-formaldehyde material having an absorbency of at least 2.0 milliliters of water per gram and selected from the group consisting of amino-formaldehyde in the form of disintegrated foams and amino-formaldehyde materials formed as precipitates from solution, the ratio of resin to filler being from 6:1 to 1:1.
Claim 2
Dependent Claim
76 words
A thermosetting moulding composition including an amino-formaldehyde resin and a filler composed of α-cellulose dispersed therein, at least about 30% by weight of said filler replaced by an unfilled amino-formaldehyde material having an absorbency of at least 2.0 milliliters of water per gram and selected from the group consisting of amino-formaldehyde in the form of disintegrated foams and amino-formaldehyde materials formed as precipitates from solution, the ratio of resin to filler being from 6:1 to 1:1.
Claim 3
Dependent Claim
21 words
A thermosetting moulding composition according to claim 1, in which the filler essentially consists of the unfilled particulate cured amino-formaldehyde material.
Claim 4
Dependent Claim
34 words
A thermosetting moulding composition according to claim 1, wherein the filler comprises from 30 to 70 percent by weight based on the total weight of the filler, of the particulate unfilled cured amino-formaldehyde material.
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) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |