US3042537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gypsum plaster
Assignee: Individual
•
Filing: 1961-06-23
•
Granted: 1962-07-03
•
Expires: 1981-06-23
Abstract
No abstract record available.
Inventors
- 👤 W J Newell
- 👤 James E Madden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 06:32
CPC Classifications
C; C04; C04B; C04B14/00; C04B14/02; C04B14/04; C04B14/06; C04B14/062; C04B22/00; C04B22/06; C04B28/00; C04B28/14; C04B28/16; C04B2111/00; C04B2111/00474; C04B2111/00482
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A GYPSUM PLASTER CONSISTING ESSENTIALLY OF GYPSUM AND A MINOE AMOUNT OF COLLOIDAL SILICA OBTAINED BY VAPOR PHASE HYDROLYSIS OF A HYDROLYZABLE SILICON COMPOUND AT A TEMPERATURE BELOW THE VAPORIZATION TEMPERATURE OF SILICA, SAID COLLOIDAL SILICA COMPRISING ABOUT 1/4% TO ABOUT 10% BY WEIGHT OF SAID GYPSUM.
Claim 2
Dependent Claim
47 words
A GYPSUM PLASTER CONSISTING ESSENTIALLY OF GYPSUM AND A MINOE AMOUNT OF COLLOIDAL SILICA OBTAINED BY VAPOR PHASE HYDROLYSIS OF A HYDROLYZABLE SILICON COMPOUND AT A TEMPERATURE BELOW THE VAPORIZATION TEMPERATURE OF SILICA, SAID COLLOIDAL SILICA COMPRISING ABOUT 1/4% TO ABOUT 10% BY WEIGHT OF SAID GYPSUM.
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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) | 1965-07-02 | 1966-01-01 | 1966-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-02 | 1970-01-01 | 1970-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-02 | 1974-01-01 | 1974-07-03 | $7700.00 | Window Closed / Lapsed |