Patent DE353952C successfully refreshed from Google Patents.
US3180784A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synthetic lignocellulose structural products
Assignee: United States Plywood Corp
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Filing: 1960-04-07
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Granted: 1965-04-27
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Expires: 1980-04-07
Abstract
No abstract record available.
Inventors
- 👤 John G Meiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:27
CPC Classifications
D; D21; D21J; D21J1/00; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31942; Y10T428/31949; Y10T428/31957
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
A STRUCTURAL HARDBOARD PRODUCT FABRICATED BY A DRY METHOD WHICH COMPRISES ADMIXING WITH LIGNOCELLULOSE FIBER, (A) A WATER-SOLUBLE, TWO DIMENSIONAL PHENOL-FORMALDEHYDE RESIN HAVING AN AVERAGE MOLECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 150 TO ABOUT 3,000 AND (B) A WATER-SOLUBLE, TWO DIMENSIONAL PHENOL FORMALDHYDE RESIN HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 5,000 TO ABOUT 15,000 IN A WEIGHT RATIO (A):(B) OF FROM ABOUT 2:1 TO ABOUT 1:2 TO PROVIDE FROM ABOUT 0.75% TO ABOUT 10% BY WEIGHT OF RESIN PER DRY WEIGHT OF FIBERS, FORMING THE FIBERS AND ASSOCIATED RESIN INTO A UNITARY MAT AND CONSOLIDATING THE MAT INTO A STRUCTIONAL PRODUCT BY MEANS OF HEAT AND PRESSURE.
Claim 2
Dependent Claim
111 words
A STRUCTURAL HARDBOARD PRODUCT FABRICATED BY A DRY METHOD WHICH COMPRISES ADMIXING WITH LIGNOCELLULOSE FIBER, (A) A WATER-SOLUBLE, TWO DIMENSIONAL PHENOL-FORMALDEHYDE RESIN HAVING AN AVERAGE MOLECULAR WEIGHT WITHIN THE RANGE OF FROM ABOUT 150 TO ABOUT 3,000 AND (B) A WATER-SOLUBLE, TWO DIMENSIONAL PHENOL FORMALDHYDE RESIN HAVING AN AVERAGE MOLECULAR WEIGHT OF FROM ABOUT 5,000 TO ABOUT 15,000 IN A WEIGHT RATIO (A):(B) OF FROM ABOUT 2:1 TO ABOUT 1:2 TO PROVIDE FROM ABOUT 0.75% TO ABOUT 10% BY WEIGHT OF RESIN PER DRY WEIGHT OF FIBERS, FORMING THE FIBERS AND ASSOCIATED RESIN INTO A UNITARY MAT AND CONSOLIDATING THE MAT INTO A STRUCTIONAL PRODUCT BY MEANS OF HEAT AND PRESSURE.
References Cited (Backward Citations)
CA506941A
Cited
US2066734A
Cited
US2620288A
Cited
US2620321A
Cited
US2805209A
Cited
US2785975A
Cited
US2856381A
Cited
US3081217A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |