Patent US3190787A successfully refreshed from Google Patents.
US3190787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gypsum board
Assignee: United States Gypsum Co
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Filing: 1963-03-04
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Granted: 1965-06-22
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Expires: 1983-03-04
Abstract
No abstract record available.
Inventors
- 👤 Robert E Muller
- 👤 Paul L Henkels
- 👤 Brendan M O'kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:54
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/14; C04B22/00; C04B22/0013; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/0062; Y; Y02; Y02W; Y02W30/00; Y02W30/50; Y02W30/91; Y10; Y10T; Y10T428/00; Y10T428/23; Y10T428/232; Y10T428/249921; Y10T428/249953; Y10T428/249967; Y10T428/249968
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A LIGHT WEIGHT GYPSUM BOARD CONSISTING ESSENTIALLY OF A NONOLITHIC CELLULAR CORE OF BORIC ACID MODIFIED SET GYPSUM AND A PAPER COVER SHEET ENCASEMENT, SAID CELLULAR GYPSUM CORE HAVING A DENSITY OF FROM 38 TO 45 POUNDS PER CUBIC FOOT AND CONTAINING BORIC ACID IN AN AMOUNT FALLING WITHIN THE AREA DEFINED BY THE STRAIGHT LINES CONNECTING THE POINTS A,B,C,D AND E, WHEREIN SAID POINTS
Claim 2
Dependent Claim
65 words
A LIGHT WEIGHT GYPSUM BOARD CONSISTING ESSENTIALLY OF A NONOLITHIC CELLULAR CORE OF BORIC ACID MODIFIED SET GYPSUM AND A PAPER COVER SHEET ENCASEMENT, SAID CELLULAR GYPSUM CORE HAVING A DENSITY OF FROM 38 TO 45 POUNDS PER CUBIC FOOT AND CONTAINING BORIC ACID IN AN AMOUNT FALLING WITHIN THE AREA DEFINED BY THE STRAIGHT LINES CONNECTING THE POINTS A,B,C,D AND E, WHEREIN SAID POINTS
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) | 1968-06-21 | 1968-12-21 | 1969-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-21 | 1972-12-21 | 1973-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-21 | 1976-12-21 | 1977-06-22 | $7700.00 | Window Closed / Lapsed |