US3385019A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wallboard and wall structure
Assignee: National Gypsum Co
•
Filing: 1960-02-04
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Granted: 1968-05-28
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Expires: 1980-02-04
Abstract
No abstract record available.
Inventors
- 👤 Ralph E Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:44
CPC Classifications
E; E04; E04F; E04F13/00; E04F13/02; E04F13/04; E04F13/042; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/24996; Y10T428/249967; Y10T428/249968
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
PLASTERBOARD OF IMPROVED JOINT CEMENT RETENTION PROPERTY CONSISTING ESSENTIALLY OF A CORE OF SET GYPSUM CRYSTALS AND PAPER LINERS COVERING SAID CORE, A TAPERED EDGE AT ONE FACE OF SAID PAPER-COVERED CORE, AND SHALLOW, DISCONTINUOUS JOINT CEMENT-RETAINING DEPRESSIONS IN SAID PAPER AND CORE AT SAID TAPERED EDGE, SAID DEPRESSIONS BEING DISPOSED WITHIN SAID TAPERED EDGE SURFACE IN A PLURALITY OF TRANSVERSE AND LONGITUDINAL ROWS AND EXTENDING THROUGH A BROKEN PORTION OF SAID PAPER, AND ADAPTED TO UNDERLIE THE EDGES OF TAPE WHEN ASSEMBLED.
Claim 2
Dependent Claim
83 words
PLASTERBOARD OF IMPROVED JOINT CEMENT RETENTION PROPERTY CONSISTING ESSENTIALLY OF A CORE OF SET GYPSUM CRYSTALS AND PAPER LINERS COVERING SAID CORE, A TAPERED EDGE AT ONE FACE OF SAID PAPER-COVERED CORE, AND SHALLOW, DISCONTINUOUS JOINT CEMENT-RETAINING DEPRESSIONS IN SAID PAPER AND CORE AT SAID TAPERED EDGE, SAID DEPRESSIONS BEING DISPOSED WITHIN SAID TAPERED EDGE SURFACE IN A PLURALITY OF TRANSVERSE AND LONGITUDINAL ROWS AND EXTENDING THROUGH A BROKEN PORTION OF SAID PAPER, AND ADAPTED TO UNDERLIE THE EDGES OF TAPE WHEN ASSEMBLED.
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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) | 1971-05-28 | 1971-11-27 | 1972-05-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-28 | 1975-11-27 | 1976-05-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-28 | 1979-11-27 | 1980-05-28 | $7700.00 | Window Closed / Lapsed |