Patent US3689229A successfully refreshed from Google Patents.
US3689229A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot water sulphur melter
Assignee: Honeywell International Inc
•
Filing: 1971-03-09
•
Granted: 1972-09-05
•
Expires: 1991-03-09
Abstract
Abstract A METHOD OF MELTING SULPHUR IN WHICH SOLID SULPHUR IS INTRODUCED INTO A PRESSURE VESSEL CONTAING HOT WATER OF A TEMPERATURE IN THE RANGE OF ABOUT 280* TO 320* IN THE SULPHUR MELTING ZONE AND LIQUID SULPHUR IS REMOVED FROM THE ZONE AFTER MELTING.
Inventors
- 👤 Robert E Lane
- 👤 Xerxes T Stoddard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:28
CPC Classifications
C; C01; C01B; C01B17/00; C01B17/02; C01B17/0221
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |