US2820134A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Heating apparatus
Assignee: Individual
•
Filing: 1954-03-08
•
Granted: 1958-01-14
•
Expires: 1974-03-08
Abstract
No abstract record available.
Inventors
- 👤 Kobayashi Keigo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:04
CPC Classifications
H; H05; H05B; H05B1/00; H05B1/02; H05B1/0202; H05B1/0208; F; F28; F28D; F28D15/00; F28D15/02; F28D15/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1780996A
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US1047417A
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US1931190A
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US2232840A
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US2300083A
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US2238318A
Cited
US2454286A
Cited
US2595527A
Cited
US2611850A
Cited
GB732905A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-01-13 | 1961-07-15 | 1962-01-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-01-13 | 1965-07-15 | 1966-01-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-01-13 | 1969-07-15 | 1970-01-14 | $7700.00 | Window Closed / Lapsed |