US3658623A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for bonding non-porous materials by means of polyfunctional aromatic cyanic acid esters
Assignee: Bayer AG
•
Filing: 1969-07-14
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Granted: 1972-04-25
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Expires: 1989-07-14
Abstract
Abstract Non-porous materials are bounded by introducing between the surfaces to be bonded monomeric polyfunctional aromatic cyanic acid esters resp. their prepolymers obtained by heat treatment of the monomeric compounds, fixing the surfaces to be bonded in the required position under intimate contact and heating the bond for a sufficient period of time up to 250* C.
Inventors
- 👤 Ernst Grigat
- 👤 Heinz Schultheis
- 👤 Eugen Bock
- 👤 Manfred Dollhausen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:07
CPC Classifications
C; C08; C08G; C08G73/00; C08G73/06; C08G73/0622; C08G73/0638; C08G73/065; C08G73/0655; C08J; C08J5/00; C08J5/12; C08J5/124; C09; C09J; C09J5/00; C09J5/06
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
15 words
The process of claim 1 wherein a monomeric polyfunctional aromatic cyanic acid ester is employed.
Claim 2
Dependent Claim
30 words
The process of claim 1 wherein said ester is a prepolymer obtained by heating a monomeric polyfunctional aromatic cyanic acid ester at a temperature of from 50* to 150* C.
Claim 3
Dependent Claim
10 words
The process of claim 1 wherein said ester is 4,4''-dicyanato-diphenyl-dimethylmethane.
References Cited (Backward Citations)
US3037979A
Cited
US3205200A
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US3053796A
Cited
US3206352A
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US3491060A
Cited
US3502617A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |