Patent US2831820A successfully refreshed from Google Patents.
US2831820A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Foamed epoxy resin composition and method of making
Assignee: Honeywell Inc
•
Filing: 1953-04-13
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Granted: 1958-04-22
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Expires: 1973-04-13
Abstract
No abstract record available.
Inventors
- 👤 Arnold S Aase
- 👤 Luther L Bolstad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:10
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J2363/00; C08J2429/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
117 words
THE METHOD OF PRODUCING A STABLE FOAM RESIN WHICH COMPRISES PREPARING A MIXTURE INCLUDING A BASE RESIN, A HARDENER FOR SAID BASE RESIN, A STABILIZER FOR SAID RESIN AND HARDENER HAVING A SETTING TIME SUBSTANTIALLY LESS THAN THE SETTING TIME OF SAID RESIN AND HARDENER TO PREVENT COLLAPSE OF THE RESIN AFTER FOAMING BUT BEFORE HARDENING, AND A BLOWING AGENT TAKEN FROM THE GROUP CONSISTING OF DIAZO AMINO BENZENE, AMMONIUM CARBONATE, AMMONIUM CARBAMATE, DINITROSO PENTAMETHYLENE TETRAMINE AND P, P'' OXYBIS (BENZENESULFONYL HYDRAZIDE), THENCE SUBJECTING SAID MIXTURE TO A TEMPERATURE IN EXCESS OF THE DECOMPOSITION TEMPERATURE OF THE BLOWING AGENT BUT NOT IN EXCESS OF ABOUT 350*F. TO FOAM THE RESIN, SAID BASE RESIN HAVING A STRUCTURAL FORMULA
Claim 2
Independent Claim
117 words
THE METHOD OF PRODUCING A STABLE FOAM RESIN WHICH COMPRISES PREPARING A MIXTURE INCLUDING A BASE RESIN, A HARDENER FOR SAID BASE RESIN, A STABILIZER FOR SAID RESIN AND HARDENER HAVING A SETTING TIME SUBSTANTIALLY LESS THAN THE SETTING TIME OF SAID RESIN AND HARDENER TO PREVENT COLLAPSE OF THE RESIN AFTER FOAMING BUT BEFORE HARDENING, AND A BLOWING AGENT TAKEN FROM THE GROUP CONSISTING OF DIAZO AMINO BENZENE, AMMONIUM CARBONATE, AMMONIUM CARBAMATE, DINITROSO PENTAMETHYLENE TETRAMINE AND P, P'' OXYBIS (BENZENESULFONYL HYDRAZIDE), THENCE SUBJECTING SAID MIXTURE TO A TEMPERATURE IN EXCESS OF THE DECOMPOSITION TEMPERATURE OF THE BLOWING AGENT BUT NOT IN EXCESS OF ABOUT 350*F. TO FOAM THE RESIN, SAID BASE RESIN HAVING A STRUCTURAL FORMULA
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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) | 1961-04-21 | 1961-10-21 | 1962-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-21 | 1965-10-21 | 1966-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-21 | 1969-10-21 | 1970-04-22 | $7700.00 | Window Closed / Lapsed |