US3620707A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass-tube reforming apparatus
Assignee: Research Corp
•
Filing: 1969-09-15
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Granted: 1971-11-16
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Expires: 1989-09-15
Abstract
Abstract Apparatus is provided for converting glass tubes of circular cross section into tubes of larger cross-sectional dimensions and of any desired cross-sectional configuration such as square, rectangular, ovoidal, or triangular.
Inventors
- 👤 Frans M Van Damme
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:28
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/04; C03B23/047; C03B23/0476
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |