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Patent US3138478A successfully refreshed from Google Patents.
US3138478A
Expired / Lapsed
US
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Method of encapsulating a particulate gas-evolving agent by polymerizing a monomer onto the surface of said agent
Assignee: Richardson Co
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Filing: 1960-07-18
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Granted: 1964-06-23
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Expires: 1980-07-18
Abstract
No abstract record available.
Inventors
- 👤 Edward A Hedman
- 👤 Selwyn R Mather
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:41
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/04; C08J9/06
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
52 words
A PROCESS OF MAKING A MOLDABLE COMPOSITION CAPABLE OF FORMING SHAPED CELLULAR ARTICLES WHICH COMPRISES INITIALLY APPLYING A POLYMERIZATION CATALYST TO THE SURFACE OF A PARTICULATE BLOWING AGENT AND SUBSEQUENTLY ENCAPSULATING THE BLOWING AGENT PARTICLES WITH A POLYMER BY CONTACTING THE PARTICLE WITH A MONOMER CAPABLE OF BEING POLYMERIZED BY SAID CATALYST.
References Cited (Backward Citations)
US2891017A
Cited
US2945827A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-23 | 1967-12-23 | 1968-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-23 | 1971-12-23 | 1972-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-23 | 1975-12-23 | 1976-06-23 | $7700.00 | Window Closed / Lapsed |