US3487423A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for producing steam
Assignee: Individual
•
Filing: 1968-07-11
•
Granted: 1969-12-30
•
Expires: 1988-07-11
Abstract
No abstract record available.
Inventors
- 👤 John B White
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 09:31
CPC Classifications
F; F22; F22B; F22B1/00; F22B1/28; F22B1/281
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US591783A
Cited
US1369212A
Cited
US915526A
Cited
US2862099A
Cited
US3014115A
Cited
US2906858A
Cited
US3185395A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-12-29 | 1973-06-30 | 1973-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-12-29 | 1977-06-30 | 1977-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-12-29 | 1981-06-30 | 1981-12-30 | $7700.00 | Window Closed / Lapsed |