Patent US2528514A successfully refreshed from Google Patents.
US3498802A
Expired / Lapsed
US
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Steam treatment process to produce thermoplastic materials and hydraulic cements
Assignee: Corning Glass Works
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Filing: 1967-04-13
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Granted: 1970-03-03
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Expires: 1987-04-13
Abstract
No abstract record available.
Inventors
- 👤 Hugh L Bickford
- 👤 Loris G Sawchuk
- 👤 Stanley D Stookey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:29
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/24; C04B28/26; C04B12/00; C04B12/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-02 | 1973-09-01 | 1974-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-02 | 1977-09-01 | 1978-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-02 | 1981-09-01 | 1982-03-03 | $7700.00 | Window Closed / Lapsed |