Patents
US 8475034 B2: Enhanced compound pendulums and systems
- Granted
- 2013-07-02
- Filed
- 2010-01-28 application 12695926
- Type
- Utility · 10 claims
- Elsewhere
- Google Patents ↗ · USPTO patent document ↗ · USPTO Patent Center record ↗
Abstract
Enhanced compound pendulums provide thermal compensation and/or barometric compensation, such as for a mechanical clock system. The enhanced compound pendulums are simple to construct, and can be more easily compensated than conventional, single-bob pendulums. The enhanced compound pendulums typically comprise material that is added above the point of rotation. Thermal expansion factors for components of the enhanced compound pendulums may preferably be chosen to provide thermal compensation to the first order. In some embodiments of enhanced compound pendulums, volume is added above the pivot to provide barometric compensation, such as by equalizing the moments above and below the pivot, or by providing geometric symmetry above and below the pivot, with a lower density above the pivot.
Source: PVGPATDIS, file of 2026-04-10 (ipg130702.xml).
Assignees
| Assignee | Type | Place | Also on furp.org | Source |
|---|---|---|---|---|
| The Long Now Foundation 3 patents | US company or organization | San Francisco, CA | LONG NOW FOUNDATION State business registration FUZZY medium confidence: same name (legal endings aside) and state LONG NOW FOUNDATION Nonprofit FUZZY medium confidence: same name (governing-board words and legal endings aside) and state | PVGPATDIS, file of 2026-04-10 |
Inventors
| Inventor | Place | Patents | Person page | Source |
|---|---|---|---|---|
| W. Daniel Hillis | Calabasas, CA | 217 | PVGPATDIS, file of 2026-04-10 |
CPC categories
| Subclass | Category | First group | Source |
|---|---|---|---|
| G04B | Mechanically-driven clocks or watches; mechanical parts of clocks or watches in general; time pieces using the position of the sun, moon or stars | G04B17/02 | PVGPATDIS, file of 2026-04-10 |
Cooperative Patent Classification, as currently assigned (one row per subclass).
Assignments and security interests
| Recorded | What | From | To | Reel/frame | Source |
|---|---|---|---|---|---|
| 2010-02-01 | Assignment Assignment of assignor's interest | HILLIS, W. DANIEL signed 2010-01-27 | THE LONG NOW FOUNDATION SAN FRANCISCO, CA | 23878/862 | ECORSEXC, file of 2026-09-25 |
Documents recorded with the USPTO Assignment Recordation Branch that list this patent. A security interest is a lender’s claim on the patent as collateral; a release ends it.
USPTO bulk data: PatentsView granted patents, disambiguated (PVGPATDIS) for patents, assignees, inventors, places and CPC categories; the USPTO Patent Assignment Dataset (ECORSEXC) for assignments and security interests. Patents filed in the last 20 years. No claims or full text. Links to other records are by name (and state): EXACT means the identical full name and state; FUZZY means a looser name match, with the confidence shown.