US3677787A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of rehardening encapsulating compositions
Assignee: United States Department of the Navy
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Filing: 1970-10-21
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Granted: 1972-07-18
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Expires: 1990-10-21
Abstract
Abstract A METHOD OF HARDENING ENCAPSULATING (POTTING) COMPOSITIONS CONTAINING A LINKAGE THAT IS SUSCEPTIBLE TO HYDROLYTIC CLEAVAGE I.E., POLYAMIDES, POLYESTER AND POLYESTER BASE TYPE POLYURETHANES, WHICH ARE EITHER IN THE VIRGIN STATE OR WHICH HAVE DETERIORATED DUE TO EXPOSURE TO A HOT, MOIST ENVIONMENT BY CONTACTING WITH A CHEMICAL HARDENING AGENT SELECTED FROM THE GROUP CONSISTING OF MULTIFUNCTIONAL ISOCYANATES, MULTIFUNCTIONAL EPOXIDES, MULTIFUNCTIONAL ISOTHIOCYANATES, CARBODIIMIDES AND MIXTURES THEREOF WHICH MAY ALSO CONTAIN A CONSTITUENT SELECTED FROM THE GROUP CONSISTING OF MONOISOCYANATES, MONOEPOXIDES, MONOISOTHIOCYANATES AND MIXTURE THEREOF.
Inventors
- 👤 Joseph M Augl
- 👤 William J Bailey
- 👤 Porter W Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 06:24
CPC Classifications
H; H01; H01B; H01B3/00; H01B3/18; H01B3/30; H01B3/42; C; C08; C08G; C08G18/00; H01B3/302; H01B3/307
Claims Analysis
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References Cited (Backward Citations)
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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) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |