US4497662A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moulded product
Assignee: Individual
•
Filing: 1983-02-22
•
Granted: 1985-02-05
•
Expires: 2003-02-22
Abstract
Abstract A process of moulding a product (and a product thus formed) wherein particulate ligno-cellulose such as shredded paper, flour, Portland cement, a small amount of caustic soda, and water are mixed together, placed in a mould, and subjected to both pressure and heat until set, and the moulded product is then removed from the mould.
Inventors
- 👤 Donald M. Chisholm
- 👤 Colin Newton
- 👤 Stanley W. Winchester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:05
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/02; C04B28/04; B; B28; B28B; B28B1/00; B28B1/52; B28B1/525; B28B7/00; B28B7/36; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
146 words
A process for moulding an article, comprising: (a) forming a mixture of between 32 and 48 parts by weight of shredded paper, between 24 and 36 parts by weight of plain wheaten flour, between 0.7 and 1.3 parts by weight of caustic soda, between 32 and 48 parts by weight of Portland cement, and a quantity of water equal to between 30% and 70% of the total weight of the other said components, (b) placing a lining of sheet material into a female mould, and pouring said mixture into said female mould, (c) placing perforate sheet material over the surface of a vented male mould, and urging the male mould into the female mould and imparting a pressure to said mixture, (d) heating said female mould to a temperature of between 66° C. and 150° C. until set, and (e) removing said article from the mould.
Claim 2
Dependent Claim
146 words
A process for moulding an article, comprising: (a) forming a mixture of between 32 and 48 parts by weight of shredded paper, between 24 and 36 parts by weight of plain wheaten flour, between 0.7 and 1.3 parts by weight of caustic soda, between 32 and 48 parts by weight of Portland cement, and a quantity of water equal to between 30% and 70% of the total weight of the other said components, (b) placing a lining of sheet material into a female mould, and pouring said mixture into said female mould, (c) placing perforate sheet material over the surface of a vented male mould, and urging the male mould into the female mould and imparting a pressure to said mixture, (d) heating said female mould to a temperature of between 66° C. and 150° C. until set, and (e) removing said article from the mould.
Claim 3
Dependent Claim
17 words
A process according to claim 1 comprising curing said article by heating after removal from the mold.
Claim 4
Dependent Claim
17 words
A process according to claim 2 wherein said curing temperature lies between 32° C. and 50° C.
Claim 5
Dependent Claim
9 words
An article made by the process of claim 1.
Claim 6
Dependent Claim
123 words
A process for moulding an article in a mould comprising: (a) forming a mixture of between 32 and 48 parts by weight of particulate ligno-cellulose, between 24 and 36 parts by weight of flour, between 0.7 and 1.3 parts by weight of caustic soda, between 32 and 48 parts by weight of Portland cement, and a quantity of water equal to between 30% and 70% of the total weight of the other said components, (b) placing said mixture in a mould, subjecting it to sufficient pressure for water to escape from said mixture, and heating the mixture to a temperature of between 150° F. and 300° F. (66° C. and 150° C.) until set, and (c) removing the set article from the mould.
Claim 7
Dependent Claim
123 words
A process for moulding an article in a mould comprising: (a) forming a mixture of between 32 and 48 parts by weight of particulate ligno-cellulose, between 24 and 36 parts by weight of flour, between 0.7 and 1.3 parts by weight of caustic soda, between 32 and 48 parts by weight of Portland cement, and a quantity of water equal to between 30% and 70% of the total weight of the other said components, (b) placing said mixture in a mould, subjecting it to sufficient pressure for water to escape from said mixture, and heating the mixture to a temperature of between 150° F. and 300° F. (66° C. and 150° C.) until set, and (c) removing the set article from the mould.
Claim 8
Dependent Claim
18 words
A process according to claim 5 comprising curing said article by heating after said removal from the mould.
Claim 9
Dependent Claim
17 words
A process according to claim 6 wherein said curing temperature lies between 32° C. and 50° C.
Claim 10
Dependent Claim
9 words
An article made by the process of claim 5.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-05 | 1988-08-06 | 1989-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-05 | 1992-08-06 | 1993-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-05 | 1996-08-06 | 1997-02-05 | $7700.00 | Window Closed / Lapsed |