Patent US3973911A successfully refreshed from Google Patents.
Patent US3331674A successfully refreshed from Google Patents.
US3331674A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluorescent lamp bulb spiral groove forming device
Assignee: Philips North America LLC
•
Filing: 1963-11-29
•
Granted: 1967-07-18
•
Expires: 1983-11-29
Abstract
No abstract record available.
Inventors
- 👤 Robert W Ireland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:33
CPC Classifications
C; C03; C03B; C03B23/00; C03B23/04; C03B23/049
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
AN APPARATUS FOR THE FORMING OF A SPIRAL GROOVE IN A TUBULAR VITREOUS ENVELOPE FOR A FLOURESCENT LAMP COMPRISING: (A) MEANS FOR SUPPORTING SAID VITREOUS ENVELOPE AT EACH END THEREOF, (B) A GROOVING DIE INCLUDING HEATING MEANS SURROUNDING SAID ENVELOPE FOR HEATING SAID ENVELOPE TO A SOFTENING TEMPERATURE, SAID GROOVING DIE HAVING FLUID PRESSURE ACTUATED PROJECTIONS ENGAGING THE HEATSOFTENED ENVELOPE, (C) AND MEANS OPERABLE TO SIMULTANEOUSLY CAUSE ROTATION OF THE END SUPPORTING MEANS AND ENVELOPE CARRIED THEREBY AND MOVEMENT OF SAID DIE LONGITUDINALLY OF SAID HEAT-SOFTENED ENVELOPE TO FORM A SPIRAL GROOVE EXTENDING SUBSTANTIALLY FROM ONE END THEREOF TO THE OTHER.
References Cited (Backward Citations)
US3137926A
Cited
US3169657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-17 | 1971-01-16 | 1971-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-17 | 1975-01-16 | 1975-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-17 | 1979-01-16 | 1979-07-18 | $7700.00 | Window Closed / Lapsed |