US3544255A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas burners
Assignee: Gas Council
•
Filing: 1968-09-09
•
Granted: 1970-12-01
•
Expires: 1988-09-09
Abstract
No abstract record available.
Inventors
- 👤 Francis George Roper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:21
CPC Classifications
C; C07; C07D; C07D215/00; C07D215/02; C07D215/16; C07D215/48; C07D215/54; C07D215/56; F; F23; F23D; F23D14/00; F23D14/46; F23D14/70; F23D2209/00; F23D2209/20
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE1144047B
Cited
US3238994A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |