US2585609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of alpha sodium tetrasilicate
Assignee: PQ Corp
•
Filing: 1948-02-16
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Granted: 1952-02-12
•
Expires: 1968-02-16
Abstract
No abstract record available.
Inventors
- 👤 John H Wills
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:45
CPC Classifications
C; C01; C01B; C01B33/00; C01B33/20; C01B33/36; C01B33/38
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
AS A NEW PRODUCT, ALPHA SODIUM TETRASILICATE IN THE FORM OF CLEAR CRYSTALS HAVING A PARTICLE SIZE RANGING FROM ABOUT 1 TO 50 MICRONS IN THEIR LARGEST DIMENSION, MOST OF THE CRYSTALS BEING IN THE FORM OF ORTHORHOMBIC PLATES, A SMALL PROPORTION OF ACICULAR OR NEEDLE-LIKE CRYSTALS BEING SOMETIMES PRESENT, SAID CRYSTALS BEING EITHER UNIAXIAL OR IF BIAXIAL BETA AND GAMMA BEING PARCTICALLY IDENTICAL, WHOSE ELONGATION IS GAMMA AND EXTINCTION PARALLEL, WHEREIN ALPHA EQUALS
Claim 2
Dependent Claim
74 words
AS A NEW PRODUCT, ALPHA SODIUM TETRASILICATE IN THE FORM OF CLEAR CRYSTALS HAVING A PARTICLE SIZE RANGING FROM ABOUT 1 TO 50 MICRONS IN THEIR LARGEST DIMENSION, MOST OF THE CRYSTALS BEING IN THE FORM OF ORTHORHOMBIC PLATES, A SMALL PROPORTION OF ACICULAR OR NEEDLE-LIKE CRYSTALS BEING SOMETIMES PRESENT, SAID CRYSTALS BEING EITHER UNIAXIAL OR IF BIAXIAL BETA AND GAMMA BEING PARCTICALLY IDENTICAL, WHOSE ELONGATION IS GAMMA AND EXTINCTION PARALLEL, WHEREIN ALPHA EQUALS
Claim 3
Dependent Claim
1 words
471+0.002
Claim 4
Dependent Claim
1 words
471+0.002
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) | 1955-02-11 | 1955-08-13 | 1956-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-02-11 | 1959-08-13 | 1960-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-02-11 | 1963-08-13 | 1964-02-12 | $7700.00 | Window Closed / Lapsed |