US2822646A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacture of a lamp envelope
Assignee: Hanovia Chemical and Manufacturing Co
•
Filing: 1955-03-30
•
Granted: 1958-02-11
•
Expires: 1975-03-30
Abstract
No abstract record available.
Inventors
- 👤 Hermann E Krefft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:01
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/02; C03B23/023; C03B23/03; C03B23/0305; C03B23/04; C03B23/09; C03B23/092; C03B23/20; C03B23/207
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-10 | 1961-08-12 | 1962-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-10 | 1965-08-12 | 1966-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-10 | 1969-08-12 | 1970-02-11 | $7700.00 | Window Closed / Lapsed |