Patent US3260635A successfully refreshed from Google Patents.
US3260635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of ribbed building board
Assignee: United States Gypsum Co
•
Filing: 1963-08-22
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Granted: 1966-07-12
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Expires: 1983-08-22
Abstract
No abstract record available.
Inventors
- 👤 Page John
- 👤 Rupert J Straub
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:21
CPC Classifications
B; B28; B28B; B28B19/00; B28B19/0092; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
133 words
IN A PROCESS PRODUCING GYPSUM BUILDING BOARD WHEREIN A PAPER SHEET IS CONVEYED ON A FLAT BELT, CALCINED GYPSUM SLURRY IS DEPOSITED THEREON AND A COVER SHEET IS ADDED SIMULTANEOUSLY THAT THE PASSAGE OF THE ASSEMBLY THROUGH A VERTICALLY-CONSTRICTED PASSAGE, WHEREBY A HEAD OF SLURRY IS MAINTAINED JUST AHEAD OF SAID PASSAGE, THE IMPROVEMENT WHICH COMPRISES (A) CONSISTING THE UPPER TRANSVERSE LIMIT OF SAID PASSAGE A CONTOURED MEMBER; (B) SUBJECTING EXTERIOR PORTIONS OF SAID COVER SHEET AS IT PASSES LONGITUDINALLY THROUGH SAID PASSAGE TO SUBATMOSPHERIC PRESSURE TO INDUCE CONTOURS THEREIN CORRESPONDING SUBSTANTIALLY TO THAT OF SAID MEMBER; (C) INTRODUCING SLURRY BETWEEN SAID SHEETS IN SUFFICIENT VOLUME TO FILL BETWEEN-SHEET SPACES INCLUDING THE CONTOURS; AND (D) MAINTAINING THE ASSEMBLY SO FORMED WITH COVER SHEET UPWARD-FACING AT LEAST UNTIL SAID SLURRY HAS BECOME SUBSTANTIALLY SELF-SUPPORTING.
Claim 2
Dependent Claim
133 words
IN A PROCESS PRODUCING GYPSUM BUILDING BOARD WHEREIN A PAPER SHEET IS CONVEYED ON A FLAT BELT, CALCINED GYPSUM SLURRY IS DEPOSITED THEREON AND A COVER SHEET IS ADDED SIMULTANEOUSLY THAT THE PASSAGE OF THE ASSEMBLY THROUGH A VERTICALLY-CONSTRICTED PASSAGE, WHEREBY A HEAD OF SLURRY IS MAINTAINED JUST AHEAD OF SAID PASSAGE, THE IMPROVEMENT WHICH COMPRISES (A) CONSISTING THE UPPER TRANSVERSE LIMIT OF SAID PASSAGE A CONTOURED MEMBER; (B) SUBJECTING EXTERIOR PORTIONS OF SAID COVER SHEET AS IT PASSES LONGITUDINALLY THROUGH SAID PASSAGE TO SUBATMOSPHERIC PRESSURE TO INDUCE CONTOURS THEREIN CORRESPONDING SUBSTANTIALLY TO THAT OF SAID MEMBER; (C) INTRODUCING SLURRY BETWEEN SAID SHEETS IN SUFFICIENT VOLUME TO FILL BETWEEN-SHEET SPACES INCLUDING THE CONTOURS; AND (D) MAINTAINING THE ASSEMBLY SO FORMED WITH COVER SHEET UPWARD-FACING AT LEAST UNTIL SAID SLURRY HAS BECOME SUBSTANTIALLY SELF-SUPPORTING.
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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) | 1969-07-11 | 1970-01-10 | 1970-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-11 | 1974-01-10 | 1974-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-11 | 1978-01-10 | 1978-07-12 | $7700.00 | Window Closed / Lapsed |