Patent US3159503A successfully refreshed from Google Patents.
US3159503A
Expired / Lapsed
US
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Method of imparting fire retardance to wood and the resulting product
Assignee: Beazer East Inc
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Filing: 1961-10-19
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Granted: 1964-12-01
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Expires: 1981-10-19
Abstract
No abstract record available.
Inventors
- 👤 Irving S Goldstein
- 👤 William A Dreher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:39
CPC Classifications
B; B27; B27K; B27K3/00; B27K3/16; B27K3/34; B27K3/52; C; C09; C09K; C09K21/00; C09K21/14; B27K2240/00; B27K2240/30; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10S428/921; Y10T; Y10T428/00; Y10T428/4935; Y10T428/662
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
112 words
METHOD OF TREATING WOOD TO IMPART THERETO FIRE RETARDANCE WITHOUT INCREASING THE HYGROSCOPICITY AND ADVERSELY AFFECTING THE DIMENSIONAL STABILITY COMPRISING IMPREGNATING WOOD WITH A SOLUTION CONSISTING ESSENTIALLY OF FROM 10 TO 50% BY COMBINED WEIGHT OF DICYANDIAMIDE, PHOSPHORIC ACID AND FORMALDEHYDE AND 90 TO 50% BY WEIGHT WATER, SAID DICYANDIAMIDE AND PHOSPHORIC ACID BEING PRESENT IN A MOLE RATIO OF ABOUT 1:1 TO 2:1, RESPECTIVELY, AND SAID FORMALDEHYDE BEING PRESENT IN AN AMOUNT OF 0.05 MOLE TO 0.15 MOLE BASED ON THE NUMBER OF MOLES OF SAID DICYANDIAMIDE, AND HEATING THE IMPREGNATED WOOD TO A FINAL TEMPERATURE BETWEEN ABOUT 70 AND 100*C., THEREBY PRODUCING A FLAME-RETARDANT, DIMENSIONALLY STABLE WOOD OF REDUCED HYDROSCOPICITY.
Claim 2
Dependent Claim
112 words
METHOD OF TREATING WOOD TO IMPART THERETO FIRE RETARDANCE WITHOUT INCREASING THE HYGROSCOPICITY AND ADVERSELY AFFECTING THE DIMENSIONAL STABILITY COMPRISING IMPREGNATING WOOD WITH A SOLUTION CONSISTING ESSENTIALLY OF FROM 10 TO 50% BY COMBINED WEIGHT OF DICYANDIAMIDE, PHOSPHORIC ACID AND FORMALDEHYDE AND 90 TO 50% BY WEIGHT WATER, SAID DICYANDIAMIDE AND PHOSPHORIC ACID BEING PRESENT IN A MOLE RATIO OF ABOUT 1:1 TO 2:1, RESPECTIVELY, AND SAID FORMALDEHYDE BEING PRESENT IN AN AMOUNT OF 0.05 MOLE TO 0.15 MOLE BASED ON THE NUMBER OF MOLES OF SAID DICYANDIAMIDE, AND HEATING THE IMPREGNATED WOOD TO A FINAL TEMPERATURE BETWEEN ABOUT 70 AND 100*C., THEREBY PRODUCING A FLAME-RETARDANT, DIMENSIONALLY STABLE WOOD OF REDUCED HYDROSCOPICITY.
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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |