Patent US2717830A successfully refreshed from Google Patents.
US2717830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing noncombustible building boards
Assignee: Individual
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Filing: 1952-02-26
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Granted: 1955-09-13
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Expires: 1972-02-26
Abstract
No abstract record available.
Inventors
- 👤 Erik B Bjorkman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:32
CPC Classifications
D; D21; D21J; D21J1/00; D21J1/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
METHOD OF PRODUCING STIFF HARD NON-COMBUSTIBLE BUILDING BOARDS COMPRISING THE STEPS OF HEATING A SLURRY OF STARCH AND ALKALINE WATER ABOVE THE GELATINIZING TEMPERATURE OF THE STARCH, PREPARING THEREFROM A DILUTED STARCH SOLUTION CONTAINING LESS THAN 2% OF STARCH, PULPING MINERAL FIBERS IN SAID SOLUTION, ACIDIFYING SAID SOLUTION BY ADDING AN ACID THERETO UNTIL THE PH-VALUE IS BELOW 6, DEWATERING THE RESULTING PULP OF FORMING IT INTO A SHEET OR BOARD ON A CONTINUOUS BOARD MACHINE AND DRYING THE SHEET.
Claim 2
Dependent Claim
80 words
METHOD OF PRODUCING STIFF HARD NON-COMBUSTIBLE BUILDING BOARDS COMPRISING THE STEPS OF HEATING A SLURRY OF STARCH AND ALKALINE WATER ABOVE THE GELATINIZING TEMPERATURE OF THE STARCH, PREPARING THEREFROM A DILUTED STARCH SOLUTION CONTAINING LESS THAN 2% OF STARCH, PULPING MINERAL FIBERS IN SAID SOLUTION, ACIDIFYING SAID SOLUTION BY ADDING AN ACID THERETO UNTIL THE PH-VALUE IS BELOW 6, DEWATERING THE RESULTING PULP OF FORMING IT INTO A SHEET OR BOARD ON A CONTINUOUS BOARD MACHINE AND DRYING THE SHEET.
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) | 1958-09-12 | 1959-03-14 | 1959-09-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-09-12 | 1963-03-14 | 1963-09-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-09-12 | 1967-03-14 | 1967-09-13 | $7700.00 | Window Closed / Lapsed |