US2767972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of plaster of paris
Assignee: Individual
•
Filing: 1952-07-12
•
Granted: 1956-10-23
•
Expires: 1972-07-12
Abstract
No abstract record available.
Inventors
- 👤 Walter L Badger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 09:39
CPC Classifications
C; C04; C04B; C04B11/00; C04B11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
95 words
THE PROCESS OF CALCINING GYPSUM WHICH COMPRISES CONTINUALLY MOVING GROUND GYPSUM IN THE FORM OF A THIN LAYER AT A CONSTANT RATE OF SPEED THROUGH A PATH DEFINED BY SURFACES INCLUDING A HOT SURFACE AND A MOVING SURFACE WHILE MAINTAINING THE HOT SURFACE AT A PREDETERMINED HEAT BY CONDUCTION FROM SUBSTANTIALLY SATURATED VAPOR AT APPROXIMATELY ATMOSPHERIC PRESSURE OF A CONDENSABLE LIQUID HAVING A BOILING POINT IN EXCESS OF 300* F. AND AT THE SAME TIME REGULATING THE SPEED OF THE MOVING SURFACE TO DETERMINE THE RATE OF FLOW OF SAID GYPSUM OVER THE HOT SURFACE.
Claim 2
Dependent Claim
95 words
THE PROCESS OF CALCINING GYPSUM WHICH COMPRISES CONTINUALLY MOVING GROUND GYPSUM IN THE FORM OF A THIN LAYER AT A CONSTANT RATE OF SPEED THROUGH A PATH DEFINED BY SURFACES INCLUDING A HOT SURFACE AND A MOVING SURFACE WHILE MAINTAINING THE HOT SURFACE AT A PREDETERMINED HEAT BY CONDUCTION FROM SUBSTANTIALLY SATURATED VAPOR AT APPROXIMATELY ATMOSPHERIC PRESSURE OF A CONDENSABLE LIQUID HAVING A BOILING POINT IN EXCESS OF 300* F. AND AT THE SAME TIME REGULATING THE SPEED OF THE MOVING SURFACE TO DETERMINE THE RATE OF FLOW OF SAID GYPSUM OVER THE HOT SURFACE.
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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) | 1959-10-23 | 1960-04-23 | 1960-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-23 | 1964-04-23 | 1964-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-23 | 1968-04-23 | 1968-10-23 | $7700.00 | Window Closed / Lapsed |