Patent US3207819A successfully refreshed from Google Patents.
US3207819A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making fibreboard
Assignee: Miller Hofft Inc
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Filing: 1961-07-13
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Granted: 1965-09-21
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Expires: 1981-07-13
Abstract
No abstract record available.
Inventors
- 👤 Harry A Raddin
- 👤 S Hunter W Brooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:05
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/20; B27N3/203; C; C08; C08L; C08L97/00; C08L97/02; C08L61/00; C08L61/04; C08L61/06; C08L61/20; C08L61/22; C08L61/24; C08L61/26; C08L61/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
A METHOD OF PRODUCING FIBEREBOARD COMPRISING MIXING A MASS OF LIQNOCELLULOSIC MATERIAL WHICH HAS BEEN STEAMED AND MECHANICALLY REDUCED TO FIBERS WITH A SOLUTION OF THE ESSENTIALLY UNREACTED IN REDIENTS OF A THERMOSETTING RESIN; COMPRISING THE RESULTING MASS TO DESIRED THICKNESS BETWEEN SEPARATELY HEATED PLATENS MAINTAINED AT A TEMPERATURE ABOVE 200*F., CREATING BETWEEN SAID PLATENS AND THROUGHOUT SAID MASS A HIGH FREQUENCY ELECTRIC FIELD; AND MAINTAINING SAID FIELD FOR A TIME SUFFICIENT TO INITIATE AND AT LEAST PARTIALLY COMPLETE THE REACTION OF SAID INGREDIENTS; SAID SOLUTION OF ESSENTIALLY UNREACTED INGREDIENTS OF THERMOSETTING RESIN HAVING A VISCOSITY UNDER ABOUT 100 C.P.S. AND A RESIN SOLIDS CONTENT OF AT LEAST ABOUT 60%.
Claim 2
Independent Claim
110 words
A METHOD OF PRODUCING FIBEREBOARD COMPRISING MIXING A MASS OF LIQNOCELLULOSIC MATERIAL WHICH HAS BEEN STEAMED AND MECHANICALLY REDUCED TO FIBERS WITH A SOLUTION OF THE ESSENTIALLY UNREACTED IN REDIENTS OF A THERMOSETTING RESIN; COMPRISING THE RESULTING MASS TO DESIRED THICKNESS BETWEEN SEPARATELY HEATED PLATENS MAINTAINED AT A TEMPERATURE ABOVE 200*F., CREATING BETWEEN SAID PLATENS AND THROUGHOUT SAID MASS A HIGH FREQUENCY ELECTRIC FIELD; AND MAINTAINING SAID FIELD FOR A TIME SUFFICIENT TO INITIATE AND AT LEAST PARTIALLY COMPLETE THE REACTION OF SAID INGREDIENTS; SAID SOLUTION OF ESSENTIALLY UNREACTED INGREDIENTS OF THERMOSETTING RESIN HAVING A VISCOSITY UNDER ABOUT 100 C.P.S. AND A RESIN SOLIDS CONTENT OF AT LEAST ABOUT 60%.
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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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |