Patent US3021244A successfully refreshed from Google Patents.
US3021244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing high density hardboard
Assignee: Individual
•
Filing: 1955-12-23
•
Granted: 1962-02-13
•
Expires: 1975-12-23
Abstract
No abstract record available.
Inventors
- 👤 John G Meiler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:20
CPC Classifications
D; D21; D21J; D21J1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN THE PRODUCTION OF HIGH DENSITY HARDBOARD, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN A MASS OF LIGNOCELLULOSE PARTICLES CONTAINING FROM 5 TO 15% OF MOISTURE BASED ON THE BONE DRY WEIGHT OF THE LIGNOCELLULOSE A RESINOUS BINDING MATERIAL, COMPACTING SAID MASS OF PARTICLES INTO A COMPACT MAT, WHILE SAID COMPACT MAT IS AT NORMAL ROOM TEMPERATURE SUBJECTING IT TO A PRESSURE OF FROM 1000 TO 5000 P.L.I. TO LEAST FINAL DENSITY, AND THEN CURING THE RESULTANT SHEET AT A PRESSURE FROM 25 TO 300 P.S.I. AT AN ELEVATED TEMPERATURE TO FINAL DENSITY.
Claim 2
Dependent Claim
92 words
IN THE PRODUCTION OF HIGH DENSITY HARDBOARD, THE IMPROVEMENT WHICH COMPRISES INCORPORATING IN A MASS OF LIGNOCELLULOSE PARTICLES CONTAINING FROM 5 TO 15% OF MOISTURE BASED ON THE BONE DRY WEIGHT OF THE LIGNOCELLULOSE A RESINOUS BINDING MATERIAL, COMPACTING SAID MASS OF PARTICLES INTO A COMPACT MAT, WHILE SAID COMPACT MAT IS AT NORMAL ROOM TEMPERATURE SUBJECTING IT TO A PRESSURE OF FROM 1000 TO 5000 P.L.I. TO LEAST FINAL DENSITY, AND THEN CURING THE RESULTANT SHEET AT A PRESSURE FROM 25 TO 300 P.S.I. AT AN ELEVATED TEMPERATURE TO FINAL DENSITY.
References Cited (Backward Citations)
US1680896A
Cited
GB508096A
Cited
US2463856A
Cited
US2579770A
Cited
US2635301A
Cited
US2695549A
Cited
US2658847A
Cited
US2649034A
Cited
US2700796A
Cited
US2700177A
Cited
US2907071A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-02-12 | 1965-08-14 | 1966-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-12 | 1969-08-14 | 1970-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-12 | 1973-08-14 | 1974-02-13 | $7700.00 | Window Closed / Lapsed |