US3453160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for making structural gypsum board for neutron shielding
Assignee: Kaiser Gypsum Co Inc
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Filing: 1963-11-12
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Granted: 1969-07-01
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Expires: 1983-11-12
Abstract
No abstract record available.
Inventors
- 👤 Arthur H Darling
- 👤 Howard L Weightman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:47
CPC Classifications
G; G21; G21F; G21F1/00; G21F1/02; C; C04; C04B; C04B28/00; C04B28/14; G21C; G21C11/00; G21C11/02; C04B2111/00; C04B2111/00474; C04B2111/00612; C04B2111/0062; C04B2111/00862; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
IN A METHOD OF FORMING A PAPER-LINED BOARD ADAPTED TO RESIST PASSAGE THERETHROUGH A NEUTRONS IMPINGING ON A SURFACE THEREOF, AND CONTAINING AS MAJOR PORTION A MASS OF SET GYPSUM CRYSTALS, THE STEPS WHICH COMPRISE CALCINING A RAW GYPSUM ROCK CONTAINING CALCIUM CARBONATE TO FORM CALCIUM SULFATE HEMI-HYDRATE CONTAINING SAID CARBONATE, INTIMATELY ADMIXING WITH SAID CALCINED MATERIAL FROM 4% TO 10% BORIC ACID EXPRESSED AS B2O3 AND BASED ON TOTAL WEIGHT OF SAID BORIC ACID PLUS SAID GYPSUM CRYSTALS, SEPARATELY INTIMATELY ADMIXING AN AMOUNT OF WATER AND AMMONIA, ADMIXING SAID AMMONIA-WATER MIXTURE WITH SAID CALCINED MATERIAL-BORIC ACID ADMIXTURE TO PREVENT EVOLUTION OF GAS AND TO FORM A PLASTIC SLURRY HAVING A PH OF FROM 6.0 TO 7.5, DEPOSITING SAID SLURRY BETWEEN A PAIR OF PAPER LINERS, FORMING INTO BOARD HARDENING AND DRYING.
Claim 2
Dependent Claim
132 words
IN A METHOD OF FORMING A PAPER-LINED BOARD ADAPTED TO RESIST PASSAGE THERETHROUGH A NEUTRONS IMPINGING ON A SURFACE THEREOF, AND CONTAINING AS MAJOR PORTION A MASS OF SET GYPSUM CRYSTALS, THE STEPS WHICH COMPRISE CALCINING A RAW GYPSUM ROCK CONTAINING CALCIUM CARBONATE TO FORM CALCIUM SULFATE HEMI-HYDRATE CONTAINING SAID CARBONATE, INTIMATELY ADMIXING WITH SAID CALCINED MATERIAL FROM 4% TO 10% BORIC ACID EXPRESSED AS B2O3 AND BASED ON TOTAL WEIGHT OF SAID BORIC ACID PLUS SAID GYPSUM CRYSTALS, SEPARATELY INTIMATELY ADMIXING AN AMOUNT OF WATER AND AMMONIA, ADMIXING SAID AMMONIA-WATER MIXTURE WITH SAID CALCINED MATERIAL-BORIC ACID ADMIXTURE TO PREVENT EVOLUTION OF GAS AND TO FORM A PLASTIC SLURRY HAVING A PH OF FROM 6.0 TO 7.5, DEPOSITING SAID SLURRY BETWEEN A PAIR OF PAPER LINERS, FORMING INTO BOARD HARDENING AND DRYING.
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) | 1972-06-30 | 1972-12-30 | 1973-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-30 | 1976-12-30 | 1977-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-30 | 1980-12-30 | 1981-07-01 | $7700.00 | Window Closed / Lapsed |