US3629055A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making fire retardant hardboard containing ammonium borate
Assignee: Abitibi Paper Co Ltd
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Filing: 1969-01-16
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Granted: 1971-12-21
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Expires: 1989-01-16
Abstract
Abstract A fire retardant hardboard is produced by adding a watersoluble hydrolyzable ammonium borate composition, in a quantity which will provide 1.3 percent to 7.0 percent by weight of boron in the hardboard, to a partially dewatered mat or to a fibrous slurry where the mole ratio of ammonium to borate expressed as the ratio of ammonium hydroxide to boric acid is from 0.3 to 1 to 0.4 to 1 and subsequently applying heat and pressure to form the hardboard.
Inventors
- 👤 Roland Hendrik Riem
- 👤 Wilhelmus Theodorus Albe Dwars
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:10
CPC Classifications
D; D21; D21H; D21H21/00; D21H21/14; D21H21/34; C; C09; C09K; C09K21/00; C09K21/02; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H5/00; D21H5/0002
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
20 words
A process as in claim 1 in which said ammonium borate composition is applied to a partially dewatered fiber mat.
Claim 2
Dependent Claim
21 words
A process as in claim 2 in which said composition is prepared by dissolving in water, ammonium hydroxide and boric acid.
Claim 3
Dependent Claim
22 words
A process as defined in claim 1 in which the mole ratio of ammonium hydroxide to boric acid is 0.3 to 1.
Claim 4
Dependent Claim
25 words
A process as defined in claim 1 in which the composition is prepared by the addition of diammonium tetraborate ((NH4)2B4O7.4H2O) and boric acid to water.
Claim 5
Dependent Claim
21 words
A process as defined in claim 1 in which the composition is added to the wood fiber slurry before mat formation.
References Cited (Backward Citations)
US1813367A
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US1924181A
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US1839136A
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US2030653A
Cited
US2884343A
Cited
US3245870A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |