Patent US2841504A successfully refreshed from Google Patents.
US2841504A
Expired / Lapsed
US
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Surface coated calcium carbonate pigments
Assignee: Wyandotte Chemicals Corp
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Filing: 1953-09-01
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Granted: 1958-07-01
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Expires: 1973-09-01
Abstract
No abstract record available.
Inventors
- 👤 Lawrence M Liggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 14:06
CPC Classifications
C; C09; C09C; C09C1/00; C09C1/02; C09C1/021; C01; C01P; C01P2004/00; C01P2004/50; C01P2004/60; C01P2004/62; C01P2004/80; C01P2006/00; C01P2006/90
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
126 words
A POWDERY, RUBBER REINFORCING GRADE PIGMENT CONSISTING OF CALCIUM CARBONATE WITH A SOLID COATING DISPERSED ON THE SURFACES OF THE PARTICLES THEREOF, SAID COATING CONSISTING OF (1) A HIGHER AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY N-ALKYL AMINES WHOSE ALKYL GROUPS CONTAIN 10-18 CARBON ATOMS AND ROSIN AMINES AND (2) A COMPOUND CONTAINING A HIGH MOLECULAR WEIGHT ORGANIC ACID RADICAL AND SELECTED FROM THE GROUP CONSISTONG OF 10-20 CARBON ATOM FATTY ACIDS, ROSIN ACIDS, LOWER ESTERS OF ROSIN ACIDS AND METALLIC SALTS OF ROSIN ACIDS, THE MOLAR RATIO OF SAID COMPOUND TO SAID HIGHER AMINE BEING IN A RANGE OF 1/1 TO 7/1, AND THE CONCENTRATION OF SAID COATING BEING SUFFICIENT TO MATERIALLY IMPROVE THE RUBBER PROCESSING AND RUBBER REINFORCING PROPERTIES OF SAID CALCIUM CARBONATE.
Claim 2
Dependent Claim
126 words
A POWDERY, RUBBER REINFORCING GRADE PIGMENT CONSISTING OF CALCIUM CARBONATE WITH A SOLID COATING DISPERSED ON THE SURFACES OF THE PARTICLES THEREOF, SAID COATING CONSISTING OF (1) A HIGHER AMINE SELECTED FROM THE GROUP CONSISTING OF PRIMARY N-ALKYL AMINES WHOSE ALKYL GROUPS CONTAIN 10-18 CARBON ATOMS AND ROSIN AMINES AND (2) A COMPOUND CONTAINING A HIGH MOLECULAR WEIGHT ORGANIC ACID RADICAL AND SELECTED FROM THE GROUP CONSISTONG OF 10-20 CARBON ATOM FATTY ACIDS, ROSIN ACIDS, LOWER ESTERS OF ROSIN ACIDS AND METALLIC SALTS OF ROSIN ACIDS, THE MOLAR RATIO OF SAID COMPOUND TO SAID HIGHER AMINE BEING IN A RANGE OF 1/1 TO 7/1, AND THE CONCENTRATION OF SAID COATING BEING SUFFICIENT TO MATERIALLY IMPROVE THE RUBBER PROCESSING AND RUBBER REINFORCING PROPERTIES OF SAID CALCIUM CARBONATE.
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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) | 1961-06-30 | 1961-12-30 | 1962-07-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-06-30 | 1965-12-30 | 1966-07-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-06-30 | 1969-12-30 | 1970-07-01 | $7700.00 | Window Closed / Lapsed |