US3508902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wetback heating apparatus
Assignee: PPG Industries Inc
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Filing: 1968-12-11
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Granted: 1970-04-28
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Expires: 1988-12-11
Abstract
No abstract record available.
Inventors
- 👤 Charles S Cusick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:13
CPC Classifications
C; C03; C03B; C03B18/00; C03B18/02; C03B18/20; C03B18/22
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) | 1973-04-27 | 1973-10-27 | 1974-04-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-27 | 1977-10-27 | 1978-04-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-27 | 1981-10-27 | 1982-04-28 | $7700.00 | Window Closed / Lapsed |