US2749263A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gypsum boards having crack resistant edge portions
Assignee: United States Gypsum Co
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Filing: 1953-07-21
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Granted: 1956-06-05
•
Expires: 1973-07-21
Abstract
No abstract record available.
Inventors
- 👤 Oliver E Gibson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 00:50
CPC Classifications
E; E04; E04C; E04C2/00; E04C2/02; E04C2/04; E04C2/043; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/2419; Y10T428/24215; Y10T428/24231; Y10T428/2424; Y10T428/24479; Y10T428/24521
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
144 words
A WALLBOARD COMPRISING A CEMENTITIOUS INFLEXIBLE CORE OF SUBSTANTIALLY UNIFORM THICKNESS AND HAVING A PAIR OF PLANAR SUBSTANTIALLY UNIFORM THICKNESS AND HAVING A PAIR BEING ENCLOSED IN FIBROUS COVER SHEETS, THE LATTER INCLUDING A FIRST SHEET SUBTENDING ONE PLANAR SIDE AND TWO OPPOSITE EDGES OF SAID CORE, SAID FIRST SHEET HAVING AN EDGE PORTION THEREOF FOLDED BACK INTO OVERLYING RELATION WITH A MARGINAL PORTION OF THE SECOND PLANAR SIDE OF THE CORE, AND A SECOND SHEET OVERLYING SAID SECOND PLANAR SIDE OF THE CORE AND THE FOLDED EDGE PORTION OF SAID FIRST SHEET, THE FOLDED BACK EDGE PORTION OF SAID FIRST SHEET AND THE OVERLYING PORTION OF SAID SECOND SHEET BEING CONGRUENTLY TAPERED AND ADHESIVELY SECURED TO EACH OTHER; THE THICKNESS OF SAID CORE ADJACENT THE ADHESIVELY SECURED TAPERED SHEET PORTIONS BEING SUBSTANTIALLY THE SAME AS THE THICKNESS OF THE REMAINDER OF SAID CORE.
Claim 2
Dependent Claim
144 words
A WALLBOARD COMPRISING A CEMENTITIOUS INFLEXIBLE CORE OF SUBSTANTIALLY UNIFORM THICKNESS AND HAVING A PAIR OF PLANAR SUBSTANTIALLY UNIFORM THICKNESS AND HAVING A PAIR BEING ENCLOSED IN FIBROUS COVER SHEETS, THE LATTER INCLUDING A FIRST SHEET SUBTENDING ONE PLANAR SIDE AND TWO OPPOSITE EDGES OF SAID CORE, SAID FIRST SHEET HAVING AN EDGE PORTION THEREOF FOLDED BACK INTO OVERLYING RELATION WITH A MARGINAL PORTION OF THE SECOND PLANAR SIDE OF THE CORE, AND A SECOND SHEET OVERLYING SAID SECOND PLANAR SIDE OF THE CORE AND THE FOLDED EDGE PORTION OF SAID FIRST SHEET, THE FOLDED BACK EDGE PORTION OF SAID FIRST SHEET AND THE OVERLYING PORTION OF SAID SECOND SHEET BEING CONGRUENTLY TAPERED AND ADHESIVELY SECURED TO EACH OTHER; THE THICKNESS OF SAID CORE ADJACENT THE ADHESIVELY SECURED TAPERED SHEET PORTIONS BEING SUBSTANTIALLY THE SAME AS THE THICKNESS OF THE REMAINDER OF SAID CORE.
References Cited (Backward Citations)
US764831A
Cited
US1034746A
Cited
US1383254A
Cited
US1540045A
Cited
US1631108A
Cited
US2350861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-06-05 | 1959-12-05 | 1960-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-06-05 | 1963-12-05 | 1964-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-06-05 | 1967-12-05 | 1968-06-05 | $7700.00 | Window Closed / Lapsed |