Patent US3002878A successfully refreshed from Google Patents.
US3002878A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Compressed cellulosic product and method of making same
Assignee: Individual
•
Filing: 1957-12-09
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Granted: 1961-10-03
•
Expires: 1977-12-09
Abstract
No abstract record available.
Inventors
- 👤 Harry K Linzell
- 👤 William R Tayler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:43
CPC Classifications
D; D21; D21J; D21J1/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
80 words
THE PROCESS OF PRODUCING A HOMOGENEOUS HARDBOARD PRODUCT IN THICKNESSES GREATER THAN ONE-HALF OF AN INCH WHICH COMPRISES PRODUCING PARTIALLY DRIED LIGNOCELLULOSIC SHEETS, BONDING TWO OR MORE OF SUCH SHEETS BY THE USE OF A BONDING AGENT IN FORMING A LAMINATED MAT, THEN PREHEATING THE MAT IN A DIELECTRIC HEATER TO A TEMPERATURE OF 400*F. TO 430*F., AND THEN APPLYING PRESSURE AND HEAT AT SUFFICIENT TEMPERATURE TO THE LAMINATED MAT TO FORM A DENSE END PRODUCT HAVING SMOOTH OPPOSED SURFACES.
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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) | 1964-10-02 | 1965-04-03 | 1965-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-02 | 1969-04-03 | 1969-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-02 | 1973-04-03 | 1973-10-03 | $7700.00 | Window Closed / Lapsed |