US3345441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hardboard pressing methods and apparatus
Assignee: Colonial Sugar Refining Co Ltd
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Filing: 1963-11-15
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Granted: 1967-10-03
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Expires: 1983-11-15
Abstract
No abstract record available.
Inventors
- 👤 Dibdin Robert William
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:01
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/20; D; D21; D21J; D21J1/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
48 words
A METHOD OF MANUFACTURING HARDBOARD SHEETS UNDER HEAT AND PRESSURE, SAID METHOD INCLUDING THE STEPS OF DETERMINING THE REQUIRED MOISTURE CONTENT OF THESHEET BY MEASURING THE THICKNESS REDUCTION WITHIN A PREDETERMINED TIME DURING PRESSING AND BY CONTROLLING THE PRESING OPERATION DEPENDING ON A PREDETERMINED RATE OF THICKNESS REDUCTION.
Claim 2
Independent Claim
48 words
A METHOD OF MANUFACTURING HARDBOARD SHEETS UNDER HEAT AND PRESSURE, SAID METHOD INCLUDING THE STEPS OF DETERMINING THE REQUIRED MOISTURE CONTENT OF THESHEET BY MEASURING THE THICKNESS REDUCTION WITHIN A PREDETERMINED TIME DURING PRESSING AND BY CONTROLLING THE PRESING OPERATION DEPENDING ON A PREDETERMINED RATE OF THICKNESS REDUCTION.
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) | 1970-10-02 | 1971-04-03 | 1971-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-02 | 1975-04-03 | 1975-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-02 | 1979-04-03 | 1979-10-03 | $7700.00 | Window Closed / Lapsed |